ASE B2 Glossary — 716 Painting and Refinishing Terms & Definitions

Every term here has a longer explanation inside the simulator

These are the short definitions, free for anyone. Simulator members get the expanded version of each term, written the way it is actually tested, plus searchable flashcards, quiz mode and B2 practice questions.

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A

A Leaking Spray GunSpray Gun Operation: A leaking spray gun is a gun that allows paint to seep out of the lid or another part of the gun body rather than being fully directed through the nozzle.
AbrasiveSurface Preparation: An abrasive is a hard material -- such as sand, crushed steel grit, aluminum oxide, silicon carbide, or crushed slag -- used to clean a surface or roughen it.
Accent StripesPaint Mixing, Matching and Applying: Accent stripes are lines applied to a vehicle to give it a decorative, customized appearance.
Acid RainFinish Defects, Causes and Cures: Acid rain is an air pollutant that can damage an automotive finish, created when sulfur dioxide or nitrogen compounds combine with moisture in the atmosphere.
AcrylicPaint Mixing, Matching and Applying: Acrylic is a thermoplastic synthetic resin used in both emulsion and solvent-based paints, and it is available in lacquer and enamel forms.
Acrylic Polyurethane EnamelPaint Mixing, Matching and Applying: Acrylic polyurethane enamel is a refinishing material known for excellent weatherability, generally delivering higher gloss and greater durability than other polyurethane enamels, and producing a hard, tile-like finish.
ActivatorPaint Mixing, Matching and Applying: An activator is an additive used to cure a two-package or multi-package enamel.
AdhesionPaint Mixing, Matching and Applying: Adhesion is the ability of one substance to stick to another.
Adhesion PromoterSurface Preparation: An adhesion promoter is a chemical pre-treatment applied to difficult-to-bond substrates - particularly plastics, aluminum, and previously painted surfaces - to chemically activate the surface and improve the mechanical and chemical bond of subsequent primer and paint layers.
AftercoolerSpray Gun Operation: An aftercooler is a device used to reduce the temperature of compressed air.
AgingPaint Mixing, Matching and Applying: Aging is the process of allowing a material to stand for a period of time before or after use.
Air CapSpray Gun Operation: The air cap is the spray gun component located at the front of the gun that directs compressed air into the material stream.
Air CompressorSpray Gun Operation: An air compressor is shop equipment used to increase and store air pressure, supplying air-powered tools and air-supplied respirators at pressures up to 200 psi.
Air DrillSurface Preparation: An air drill is a pneumatically powered rotary tool used in collision repair for drilling holes, driving fasteners, removing decals with eraser wheels, and operating grinding or cutting accessories - offering lighter weight, higher RPM, and longer continuous run capability than comparable electric drills.
Air DryerSpray Gun Operation: An air dryer is a device used to purify compressed air, using a permanent membrane that permits the passage of air while removing moisture.
Air FilterSpray Gun Operation: An air filter is a device used to trap dirt particles and other debris in an air line -- including the filter through which all air entering a compressor must pass.
Air GunSurface Preparation: An air gun is a device that uses compressed air to clean and dry surfaces and areas.
Air HornsSpray Gun Operation: The two protruding ears or horns on the outer face of a spray gun's air cap that direct compressed air jets inward to shape the round atomized spray cone into a flat fan pattern - the orientation of the air horns determines whether the spray fan is horizontal or vertical.
Air LineSpray Gun Operation: An air line is a pipe or flexible hose used to transport compressed air from one point to another.
Air Line LubricatorSpray Gun Operation: An air line lubricator is installed on the leg or branch line furnishing air to air-powered tools, to help maintain them and keep them operating properly.
Air Makeup UnitSpray Gun Operation: An air makeup unit is spray booth equipment that supplies heated air (commonly around 140°F) to force-dry a freshly painted vehicle using hot airflow.
Air PressureSpray Gun Operation: Air pressure is the force exerted by compressed air, measured in pounds per square inch (psi) or kilopascals (kPa) -- such as the air delivered to a paint spray gun.
Air Pressure RegulatorSpray Gun Operation: An air pressure regulator is a pneumatic device installed in the compressed air supply line that reduces high compressor tank pressure to a lower, adjustable working pressure and automatically holds that pressure steady regardless of fluctuations in the main air supply.
Air SanderSurface Preparation: An air sander is a pneumatically powered abrasive tool used in collision repair and paint preparation to strip old finish, level body filler, scuff primers, and sand repaired surfaces - available in dual-action (DA), straight-line, and rotary configurations for different stages of surface preparation.
Air SprayingSpray Gun Operation: Air spraying is a method of applying paint as tiny droplets in air, atomized by a spray gun as the material is forced into a high-velocity air stream.
Air Supply SystemSafety Precautions: An air supply system is an air pumping system that supplies fresh breathing air to a painter working in a paint spray booth.
Air TankSpray Gun Operation: A heavy-gauge steel tank that stores a reserve supply of compressed air, smoothing out pressure fluctuations and supplying demand for spray guns and other pneumatic tools.
Air Tank Shutoff ValveSpray Gun Operation: An air tank shutoff valve is a manually operated valve installed between the compressor tank outlet and the shop air distribution system that allows the technician to isolate the stored air pressure in the compressor tank from the rest of the shop plumbing for maintenance, safety, or system isolation purposes.
Air TransformerSpray Gun Operation: An air transformer is a pneumatic control device used to filter and control the air delivered by a compressor.
Air ValveSpray Gun Operation: The air valve is the internal spray gun component that controls the flow of compressed air through the gun body - it opens first when the trigger is pulled, before the fluid valve opens, ensuring that atomizing air is always flowing before paint enters the air stream.
Air VentSpray Gun Operation: Allows atmospheric pressure to enter the spray gun cup.
Air-Purifying RespiratorSafety Precautions: An air-purifying respirator is a filtered breathing aid that cleans or purifies the air the wearer breathes, protecting against vapors and spray mists given off by one-part enamels and lacquers.
Air-Supplied RespiratorSafety Precautions: An air-supplied respirator is a personal protective equipment device that delivers clean, breathable air to the wearer from an external compressor or air tank through a hood or mask - required when spraying isocyanate-containing paints or other toxic materials that exceed the protection capability of a standard filter respirator.
AirbrushSpray Gun Operation: An airbrush is a miniature, precision spray gun that uses low air pressure and a very fine fluid needle to apply paint in extremely thin, controlled lines or gradients - used primarily for custom decorative paintwork, artwork, detailing, and blending complex patterns.
AlcoholPaint Mixing, Matching and Applying: Alcohol is a colorless volatile liquid used as a diluent, solvent, or cosolvent in paints, and also used as a fuel for racing engines.
AlkydPaint Mixing, Matching and Applying: Alkyd is a chemical combination of an alcohol, an acid, and an oil, useful in water-based house paint and in automotive primers.
Alkyd EnamelPaint Mixing, Matching and Applying: Alkyd enamel is the least expensive of the enamels -- a paint that dries in two stages, first by evaporation of the solvent and then by oxidation of the binder.
AlligatoringFinish Defects, Causes and Cures: Alligatoring is a paint finish defect in which the surface cracks into a pattern resembling alligator skin.
AlloyVehicle Systems Knowledge: An alloy is a mixture of two or more metals.
Alternate Color ChipsPaint Mixing, Matching and Applying: Alternate color chips are color chips tinted slightly differently from the standard color chip for the same paint code.
Ambient TemperaturePaint Mixing, Matching and Applying: Ambient temperature is the temperature of the surrounding air.
American National Standards Institute (ANSI)Safety Precautions: The organization whose standards, such as Z87.1 for eye protection, set the certification requirements for safety equipment used in shops nationwide.
American Society For Testing And Materials (ASTM)Safety Precautions: ASTM is the standards organization whose specifications define acceptable insulating gloves for electrical work -- gloves must meet ASTM standard specifications to provide the protection they claim.
AnodizingSurface Preparation: Anodizing is an electrolytic surface treatment for aluminum that builds up an aluminum oxide coating on the metal.
Anti-Chip CoatingSurface Preparation: Anti-chip coating is a thick, rubberized or plastic-based protective material sprayed or applied to the lower body panels, rocker panels, and wheel well areas of a vehicle to absorb and resist impact damage from gravel, stones, and road debris that would chip or crack a standard paint finish.
Anti-seize CompoundVehicle Systems Knowledge: A metallic-paste thread lubricant (typically aluminum, copper, or nickel-based) applied to fastener threads before installation to prevent galvanic corrosion, galling, and thread seizure - ensuring the fastener can be removed without damage even after extended exposure to heat and corrosive environments.
Antifouling PaintSafety Precautions: Antifouling paint is a paint containing toxic substances that inhibit the growth of certain organisms on ship bottoms.
Applicator WandSurface Preparation: An applicator wand is a long spray tool, fitted with a 360-degree pattern nozzle, used to apply corrosion-resistant coating inside closed body panels like rocker panels and frame rails.
Aqueous Film Forming Foam (AFFF)Safety Precautions: A fire-extinguishing foam that seals the surface of a flammable liquid fire, cutting off oxygen and preventing re-ignition.
ArcingSpray Gun Operation: Arcing is a spray gun technique error in which the gun is moved in a curved, fan-like motion rather than kept parallel to the surface, causing the gun-to-surface distance to vary across each stroke and producing uneven film thickness, dry spray at the stroke edges, and orange peel.
AsbestosSafety Precautions: Asbestos is a cancer-causing material once used in the manufacture of brake and clutch linings.
Asbestos DustSafety Precautions: Asbestos dust is a hazardous particulate released when brake pads, clutch discs, or gaskets containing asbestos fibers are disturbed - a known carcinogen that must never be blown with compressed air but instead removed with a HEPA vacuum or wet method to prevent inhalation.
ASE CertificationLegal and Environmental Practices: ASE certification is a voluntary testing program that provides recognition that a person is a knowledgeable collision repair technician or estimator.
AsphyxiationPaint Mixing, Matching and Applying: The inability to breathe normally due to inhaling mists, gases, or fumes that displace or block oxygen intake.
AssemblyVehicle Systems Knowledge: An assembly is two or more parts bolted or welded together to form a single unit -- several parts put together before the whole is attached.
Atmosphere-Supplied RespiratorSafety Precautions: An atmosphere-supplied respirator is a system using a blower or special compressor to supply clean, fresh outside air to a face mask or hood.
AtomizationSpray Gun Operation: Atomization is the process by which a spray gun breaks liquid paint into a fine mist of tiny, uniformly sized droplets that travel to the surface and flow together into a smooth, even film - the fundamental mechanism that produces a quality spray finish.
AtomizeSpray Gun Operation: The action of a spray gun breaking liquid paint into a fine, uniform mist of droplets through compressed air, allowing the coating material to be evenly deposited onto the surface being refinished.
Automated External Defibrillator (AED)Safety Precautions: A shop safety device that delivers a controlled shock to the heart during cardiac emergencies; its adhesive pads require bare, dry skin contact and its voice prompts must be followed exactly.
Automatic CutoffSpray Gun Operation: An automatic cutoff is a safety device used to shut off an air compressor at a preset pressure.
Automatic UnloaderSpray Gun Operation: An automatic unloader is a compressor control valve that opens to release air pressure from the compression cylinder head when the tank reaches its maximum pressure setting, allowing the compressor motor to continue running unloaded (with no pumping work) rather than cycling on and off repeatedly.
Automotive Service Association (ASA)Legal and Environmental Practices: ASA is a national automotive service industry association, listed in the source material among the organizations serving the collision repair and automotive service trades.

B

Baked-On FinishPaint Mixing, Matching and Applying: A baked-on finish is a painted surface that has been cured by heating after application.
BandingPaint Mixing, Matching and Applying: Banding is a single coat applied in a small spray pattern to frame in the area to be painted.
Banding CoatPaint Mixing, Matching and Applying: A banding coat is a spray pass applied specifically along the edges, corners, and ends of panels before the main full-panel coats are applied, ensuring that these areas - which are difficult to reach with a normal spray stroke - receive adequate film build and coverage.
Barrier CreamSafety Precautions: Barrier cream is a hand cream that provides protection and soothes the skin when working with irritating materials.
BasePaint Mixing, Matching and Applying: The base is the resin component of paint to which color pigments and other components are added.
BasecoatPaint Mixing, Matching and Applying: A basecoat is the coat of paint over which the final coats are applied.
Basecoat BlenderPaint Mixing, Matching and Applying: Basecoat blender is a clear, solvent-based blending medium (also called a wetbed) applied to adjacent panels before the color basecoat is sprayed, keeping the panel surface wet to allow the color coat to flow and fade into the existing finish without creating a hard edge.
Basecoat/ClearcoatPaint Mixing, Matching and Applying: Basecoat/clearcoat is a paint method in which a highly pigmented basecoat provides the color effect and a clearcoat applied over it provides gloss and durability.
BinderPaint Mixing, Matching and Applying: A binder is an ingredient in paint that holds pigment particles together.
BlastersSurface Preparation: Blasters are air-powered tools that force sand, plastic beads, or another abrasive onto a surface for paint removal.
Bleeder GunSpray Gun Operation: A bleeder gun is a spray gun design that allows air to pass through the gun at all times, preventing pressure buildup in the supply lines.
BleedingPaint Mixing, Matching and Applying: Bleeding is the original color showing through after a new topcoat has been applied.
BlendPaint Mixing, Matching and Applying: The technique of spraying new color gradually into an adjacent undamaged panel so that any difference between new and existing paint is not visually perceptible. A clearcoat is typically applied over the blended panel to complete the repair.
Blend CoatsPaint Mixing, Matching and Applying: Blend coats are a series of progressively thinner, extended spray passes applied at the boundary between a repaired area and the original finish, designed to gradually thin and fade the new color so no visible color difference or transition line is detectable.
Blending SolventPaint Mixing, Matching and Applying: Blending solvent is a product formulated to help melt new paint into the original finish where they meet during spraying.
BlisteringFinish Defects, Causes and Cures: Blistering is the formation of hollow bubbles or water droplets in a paint film, usually caused by expansion of air or moisture trapped beneath the film.
Block SandingSurface Preparation: Block sanding is the use of a flat object, such as a block of wood, together with sandpaper to obtain a flat surface.
BloomFinish Defects, Causes and Cures: Bloom is a clouded appearance that develops on a finish paint coat.
BlowgunSpray Gun Operation: A blowgun is a device that uses blasts of compressed air to help clean and dry work surfaces.
BlushingFinish Defects, Causes and Cures: Blushing is the hazing or whitening of a paint film caused by retention of moisture in the drying film.
Body TrimPaint Mixing, Matching and Applying: Body trim refers to (1) the material used to finish the interior of the passenger and trunk compartments, and (2) the rubber and metal moldings on the exterior of a vehicle.
Bounce-BackSpray Gun Operation: Bounce-back is the atomized paint particles that rebound off the surface being sprayed and contribute to overspray.
BracketsVehicle Systems Knowledge: A bracket is a part used to attach components to each other, or to attach a component to the body or frame.
BridgingSurface Preparation: Bridging is a characteristic of an undercoat in which a scratch or surface imperfection is spanned over rather than completely filled.
BrittleFinish Defects, Causes and Cures: Brittle describes a material that lacks toughness and flexibility.
BronzingFinish Defects, Causes and Cures: Bronzing is the formation of a metallic-appearing haze on the surface of a paint film.
BrushPaint Mixing, Matching and Applying: Brush refers both to a method of applying paint and to the applicator used to apply it.
BuffFinish Defects, Causes and Cures: To buff is to polish a painted surface by hand or machine, using abrasive compounds, to eliminate surface scratches and restore gloss.
Buffer/PolisherPaint Mixing, Matching and Applying: A buffer/polisher is a variable-speed rotary or dual-action electric or pneumatic tool that spins a buffing pad to apply and work polishing compounds into the paint surface, removing fine scratches, sanding marks, oxidation, and swirl marks to restore a high-gloss finish.
Buffing CompoundFinish Defects, Causes and Cures: Buffing compound is an abrasive paste or cake used with a cloth or sheepskin pad to remove fine scratches and polish a paint finish.
Buffing MachineFinish Defects, Causes and Cures: A buffing machine is an electric or pneumatic rotary polishing tool used with abrasive compounds and buffing pads to mechanically remove paint surface defects - including orange peel, sanding scratches, compound swirls, and oxidation - and restore a smooth, high-gloss finish.
Buffing PadFinish Defects, Causes and Cures: A buffing pad is the foam, wool, or microfiber interface mounted on a buffer or polisher that holds and distributes polishing compound across the paint surface - with different pad materials providing different levels of cut and finish from aggressive cutting to final gloss.
BuildPaint Mixing, Matching and Applying: Build is the amount of paint film deposited on a surface, measured in mils.
Bull's-Eye FeatheredgeFinish Defects, Causes and Cures: A bull's-eye featheredge is a paint defect appearing as a circular ring or depression in the finish coat, caused by shrinkage of the spot putty or body filler underneath - the filler or putty contracts after painting, pulling the topcoat down into the shape of a bull's-eye around the repair area.
BurnishingFinish Defects, Causes and Cures: Burnishing is the polishing or buffing of a finish, by hand or by machine, using a compound or liquid.
Butyl AcetatePaint Mixing, Matching and Applying: Butyl acetate is a paint solvent, often used in lacquers.

C

Caged PlateVehicle Systems Knowledge: A caged plate is a heavy, thick steel plate with threaded holes that accept large bolts.
CalciumPaint Mixing, Matching and Applying: Calcium is a metal used as a component of paint dryers and pigments.
CalibrateSpray Gun Operation: To calibrate is to check equipment to confirm it meets test specifications and that its settings are correct.
California Air Resources Board (CARB)Legal and Environmental Practices: California's state environmental agency that regulates vehicle and refinish-product emissions, working alongside the federal EPA.
CanisterSafety Precautions: A canister is a container of chemicals designed to remove specific vapors and gases from breathing air -- for example a container filled with charcoal.
Carbon Monoxide (CO)Paint Mixing, Matching and Applying: Carbon monoxide (CO) is a deadly gas created by the incomplete burning of fuel.
CarcinogensSafety Precautions: Carcinogens are cancer-causing agents.
Carnauba WaxFinish Defects, Causes and Cures: Carnauba wax is a hard wax obtained from a species of palm tree, used in some body polishing materials.
Cartridge Filter RespiratorSafety Precautions: A cartridge filter respirator protects against vapors and spray mists given off by one-part enamels or lacquers, and is used in well-ventilated areas.
Cartridge RespiratorSafety Precautions: A cartridge respirator is a functioning, properly fitted respirator with replaceable cartridges and prefilters that protects a painter from uncatalyzed paint.
CatalystPaint Mixing, Matching and Applying: A hardener added to two-component (2K) paint systems in precise ratios to initiate a chemical cross-linking reaction that cures and hardens the paint film into a durable, weather-resistant coating.
CentimeterPaint Mixing, Matching and Applying: A centimeter is a unit of linear measure in the SI metric system.
Centipoise (CPS)Paint Mixing, Matching and Applying: Centipoise, abbreviated CPS, is a unit of viscosity appearing on the viscosity conversion chart used to relate viscosity measurements to one another.
ChalkingFinish Defects, Causes and Cures: Chalking is the result of weathering of a paint film, characterized by loose pigment particles on the paint surface.
CheckFinish Defects, Causes and Cures: A check is a small crack in a paint film.
Chemical BurnSafety Precautions: A chemical burn is an injury that results when a corrosive chemical strikes the skin or eye.
Chemical BurnsSafety Precautions: Chemical burns are severe skin or eye injuries caused by contact with corrosive shop chemicals such as paint removers and parts cleaners.
Chemical Paint RemoverSurface Preparation: Chemical paint remover is a caustic, solvent-based or acid-based compound applied to painted surfaces to chemically break down and lift paint coatings - requiring full personal protective equipment (full face shield and chemical-resistant gloves) due to its ability to cause severe chemical burns on skin and eyes.
Chipped PaintPaint Mixing, Matching and Applying: Small areas where the paint film has been knocked loose or removed by mechanical impact, such as flying stones or road debris, exposing the primer or substrate underneath.
ChippingFinish Defects, Causes and Cures: Chipping is the breaking away of a small portion of paint film, caused by the film's inability to flex under impact or under thermal expansion and contraction.
ChromaPaint Mixing, Matching and Applying: Chroma is the strength or intensity of a color -- the degree to which it differs from the white, gray, or black of the neutral axis of the color tree. It is often referred to as saturation.
Chronic EffectSafety Precautions: A chronic effect is an adverse effect on a human or animal with symptoms that develop slowly over a long period of time, or that recur frequently.
Clean Air ActLegal and Environmental Practices: The federal law that prohibits venting refrigerant into the atmosphere and requires certified recovery equipment before opening any charged A/C component.
CleanerSurface Preparation: A cleaner is a material used to clean a substrate before further work is performed on it.
Clear CoatPaint Mixing, Matching and Applying: A transparent, pigment-free paint layer applied as the final coat over a colored basecoat. It protects the color from UV exposure, chemical damage, and abrasion while providing gloss and depth to the finish.
Closed Coat AbrasiveSurface Preparation: A closed coat abrasive is a coated abrasive material in which the abrasive grains are spaced as close together as possible.
CloudingFinish Defects, Causes and Cures: Clouding is the formation or presence of a haze in a liquid or on a film.
CoatingsPaint Mixing, Matching and Applying: Any film-forming material applied to a surface to provide protection against corrosion, weathering, abrasion, or other environmental attack - or to achieve a desired appearance - encompassing the entire automotive refinishing system from primer to clearcoat.
CobwebbingFinish Defects, Causes and Cures: Cobwebbing is the tendency of sprayed paint to form strings or strands rather than droplets as it leaves the spray gun.
ColorPaint Mixing, Matching and Applying: Color is the visual appearance of a material, such as red, yellow, blue, or green.
Color CatalogPaint Mixing, Matching and Applying: A color catalog is a maintained collection of sprayed and stored test/let-down panels kept by a shop or painter as a reference library for matching future repairs to previously mixed colors.
Color CoatPaint Mixing, Matching and Applying: A color coat is any paint applied to a surface specifically to provide color -- in a basecoat/clearcoat system the color coat (basecoat) provides color coverage while a separate clearcoat provides gloss and UV protection; in a single-stage system the color coat provides both color and gloss.
Color FacePaint Mixing, Matching and Applying: Color face is the side seen when a metallic color is viewed at right angles, perpendicular to the surface.
Color Flip-FlopPaint Mixing, Matching and Applying: Color flip-flop is the phenomenon in metallic and pearl paint where the apparent color shifts - sometimes dramatically - when the viewing angle changes from face-on (direct view) to side (flop view), caused by the orientation and depth of metallic flake or pearl particles within the color coat.
Color HoldoutSurface Preparation: Color holdout is the ability of a primer-sealer to allow the finish coat applied over it to maintain its high gloss.
Color MatchingPaint Mixing, Matching and Applying: Color matching is the steps needed to make the new finish on a vehicle match the existing finish.
Color Rendering Index (CRI)Paint Mixing, Matching and Applying: A rating of how accurately a light source reveals an object's true color; aging spray booth bulbs lower the CRI and undermine color matching.
Color RetentionPaint Mixing, Matching and Applying: Color retention is the permanence of a color under a specified set of conditions.
Color SandFinish Defects, Causes and Cures: The wet or dry finish-sanding operation performed on a cured clearcoat or single-stage topcoat to level and remove surface defects - primarily dust nibs, dirt inclusions, and runs - using progressively finer abrasive grits before machine buffing to restore full gloss.
Color SpectrumPaint Mixing, Matching and Applying: The color spectrum is light that has been broken down into its separate colors by passing through a prism.
Color Test PanelPaint Mixing, Matching and Applying: A color test panel is a prepared black-and-white coated cardboard panel used to apply a spray-out of the mixed paint for comparison against the vehicle's existing finish before any paint is applied to the vehicle, verifying color match under varied lighting conditions.
Color TreePaint Mixing, Matching and Applying: The color tree (also called the Munsell color tree or color solid) is a three-dimensional organizational model that arranges all visible colors by three properties - value (lightness/darkness), hue (color identity), and chroma (saturation) - giving refinishers a systematic framework for diagnosing and correcting color mismatches.
Color-corrected Light BulbsPaint Mixing, Matching and Applying: Bulbs engineered to closely match the full spectrum of natural daylight, used wherever paint color is being viewed, mixed, or matched so the color read is accurate.
Color-Matching GuidesPaint Mixing, Matching and Applying: Color-matching guides are manufacturer-produced reference tools - available as physical chip books or digital databases - that organize paint formulas, color chip samples, and tinting variants by vehicle manufacturer, year, and color code, allowing refinishers to select the most accurate starting formula for a given vehicle.
Combination PliersVehicle Systems Knowledge: Combination pliers are the most common type of pliers, with both flat and curved gripping surfaces and two jaw-opening positions.
CompatibilityPaint Mixing, Matching and Applying: Compatibility is the ability of two or more materials to be used together.
CompoundingFinish Defects, Causes and Cures: Compounding is the abrasive cutting process of applying polishing or rubbing compound to a cured paint surface - either by machine (buffer) or by hand - to mechanically remove surface defects such as orange peel, sanding scratches, paint runs, dust nibs, and oxidation, leaving a smooth surface ready for polishing.
Compressed Air Supply SystemSpray Gun Operation: The compressed air supply system is the complete network of components - compressor, storage tank, distribution lines, filters, moisture separators, and pressure regulators - that generates, conditions, stores, and delivers clean, dry, regulated compressed air to all spray guns and pneumatic tools throughout the collision repair facility.
Compressor Air TankSpray Gun Operation: The compressor air tank (air receiver) is the heavy-gauge steel cylindrical storage vessel that holds compressed air between compressor cycles, acting as a buffer to meet peak demand, allowing moisture to condense and settle for draining, and reducing pressure fluctuations at spray guns and air tools.
Compressor Drain ValveSpray Gun Operation: The compressor drain valve is the valve located at the lowest point of the compressor air tank that is opened daily to discharge accumulated water condensation and contaminant sludge, preventing internal tank corrosion, moisture contamination of air lines, and degraded paint and tool performance.
Compressor Oil PlugsSpray Gun Operation: Compressor oil plugs are the fill plug and drain plug on a reciprocating air compressor pump crankcase that provide access for checking, adding, and replacing the pump lubrication oil at manufacturer-specified service intervals.
Computer Based Testing (CBT)Legal and Environmental Practices: Computer Based Testing, or CBT, is the delivery of the certification test on a computer rather than on paper, with the advantage that the candidate receives test results immediately.
ConcentrationPaint Mixing, Matching and Applying: Concentration is the amount or ratio of a substance present in a solution.
ConsistencyPaint Mixing, Matching and Applying: Consistency is the fluidity of a liquid or of a system -- how thick or thin it is.
ContaminantsPaint Mixing, Matching and Applying: Contaminants are foreign substances on a surface to be painted, or in the paint itself, that adversely affect the finish.
Continuous SanderSurface Preparation: A continuous sander is a sander that uses an abrasive belt to remove paint and to sand body filler.
Contour Mapping/Edge MappingFinish Defects, Causes and Cures: Contour mapping and edge mapping are paint defects where the underlying body line, panel edge, or repair contour becomes visible as a raised or depressed outline through the topcoat.
ContractLegal and Environmental Practices: A contract is an agreement in the form of a written legal document between two or more people.
Contractual and Warranty ObligationsLegal and Environmental Practices: Contractual and warranty obligations are the legal commitments a shop must recognize and honor, arising from repair contracts with customers and from manufacturer or shop warranty terms.
Control of Substances Hazardous to Health (COSHH)Safety Precautions: The UK regulations governing hazardous substance handling, which make respiratory protection mandatory in body shop operations even when ventilation is provided.
Conversion CoatingSurface Preparation: A conversion coating is a chemical treatment applied to galvanized steel, uncoated steel, and aluminum to prevent rust.
Copper (Cu)Vehicle Systems Knowledge: Copper is a metal that is a difficult substrate to paint, and is also used in the manufacture of pigments and dryers.
Corporate Average Fuel Economy (CAFE)Legal and Environmental Practices: The U.S. federal fuel economy standard that requires each vehicle manufacturer to achieve a specified average fuel economy across its entire fleet of passenger vehicles.
CorrosionPreparation: Corrosion is the electrochemical deterioration of metal - primarily steel - through oxidation reactions with moisture and oxygen that convert iron into iron oxide (rust), progressively weakening and eventually destroying the metal unless prevented or treated.
CorrosivenessSafety Precautions: Corrosiveness is an EPA hazardous waste characteristic for solutions with a pH below 2.0 or above 12.5, capable of dissolving metals or burning skin.
CouplingSpray Gun Operation: A coupling is a quick-disconnect fitting - male plug on one side, female body on the other - used to connect and disconnect air hoses, spray guns, and pneumatic tools to the shop's compressed air supply system rapidly without wrenches or tools.
CoveragePaint Mixing, Matching and Applying: Coverage is the area that a given quantity of paint will cover when applied according to the manufacturer's directions.
CrackingFinish Defects, Causes and Cures: Cracking is the splitting of a paint film, usually as straight lines that penetrate the full film thickness -- often the result of overbaking.
CrateringFinish Defects, Causes and Cures: Cratering is the formation of holes in a paint film where the paint fails to cover, caused by surface contamination.
CrawlingSolving Paint Application Problems: Crawling is a wet paint film defect in which the film pulls away from, or fails to wet, certain areas.
CreeperSafety Precautions: A creeper is a low platform on four caster rollers that a technician lies on for mobility when working under a vehicle.
CreepingSolving Paint Application Problems: Creeping is a condition in which paint seeps underneath the masking tape.
CrosslinkPaint Mixing, Matching and Applying: The chemical curing reaction in two-component (2K) automotive refinishing products in which the resin polymer chains form covalent bonds with the activator (hardener/catalyst) molecules - creating an irreversible, three-dimensionally cross-linked polymer network that transforms the liquid mixture into a hard, chemically resistant film.
Crows FeetGeneral Trade Terms: A paint film defect characterized by a network of fine, angular surface cracks radiating from a central point - resembling the angular shape of a bird's foot - caused by loss of paint film flexibility through UV degradation, thermal cycling, or solvent attack that causes the film to crack before the underlying substrate moves.
Cubic CentimeterPaint Mixing, Matching and Applying: A cubic centimeter is a unit of volume in the SI metric system, equal to one milliliter.
Cubic Feet Per Minute (CFM)Spray Gun Operation: Cubic feet per minute is the volume of air delivered by a compressor to an air tool -- the measure of a compressor's output.
CuringPaint Mixing, Matching and Applying: Curing is the chemical reaction that hardens paints and other materials which dry by chemical change.
Custom PaintPaint Mixing, Matching and Applying: Custom paint is the refinishing or decorating of a vehicle in a personalized manner.
Custom-Mixed TopcoatPaint Mixing, Matching and Applying: A custom-mixed topcoat is a special blend of paint, often used when attempting to match a badly oxidized or faded finish -- as opposed to factory-packaged paint proportioned to the original color.
Cut-InsPaint Mixing, Matching and Applying: Cut-ins are the defined edges where a basecoat/clearcoat blend transitions into an adjacent, unpainted panel section, requiring careful technique to keep the transition line clean and invisible.

D

DA (Dual-Action Sander)Surface Preparation: DA (short for dual-action, referring to a disc orbital sander) is a hand-held power sander whose disc both spins and orbits at the same time, used to remove sanding scratches and level surfaces without leaving swirl marks.
DecalPaint Mixing, Matching and Applying: A decal is a paint film in the form of a picture or lettering that can be transferred from a temporary paper backing onto another surface.
DeductiblePaint Mixing, Matching and Applying: A deductible is the amount of the insurance claim that the vehicle owner must pay, with the remainder paid by the insurance company.
DegradationFinish Defects, Causes and Cures: Degradation is the gradual or rapid disintegration of a paint film.
DegreasingSurface Preparation: Degreasing is the cleaning of a substrate, usually metal, by removing greases, oils, and other surface contaminants.
DehydrationPaint Mixing, Matching and Applying: Dehydration is the removal of water.
DelaminateFinish Defects, Causes and Cures: A paint adhesion failure in which one or more complete layers of the finish system physically separate and peel away from the layer beneath - distinct from surface cracking, as delamination involves an entire film layer detaching at an interface rather than cracking within a layer.
DensityPaint Mixing, Matching and Applying: Density is the mass of a material per unit of volume, usually expressed in grams per cubic centimeter.
Department Of Labor (DOL)Legal and Environmental Practices: DOL is the abbreviation for the U.S. Department of Labor.
Detail SandingSurface Preparation: Detail sanding uses a small dirt-nib sanding block and extra-fine sandpaper to level and smooth small specks of debris in a finish.
DetailingFinish Defects, Causes and Cures: Detailing is the final cleanup and touch-up on a vehicle -- a series of steps to clean and shine all visible exterior and interior surfaces, including using a small sanding block and extra-fine sandpaper to level specks of debris in the finish.
Detailing ClaySolving Paint Application Problems: Detailing clay is a soft clay bar, used with a liquid lubricant, that lifts light overspray and surface contaminants off paint without damaging the underlying finish.
Dew PointPaint Mixing, Matching and Applying: Dew point is the temperature at which water vapor condenses from the air.
Diagnosis ChartSolving Paint Application Problems: A diagnosis chart is a structured reference table - provided by paint manufacturers - that lists common paint and application defects, their most probable causes (technique, product, environment, substrate), and the recommended corrective or preventive procedures for each defect.
DieVehicle Systems Knowledge: A die is a cutting tool used to make external threads or to restore damaged threads.
Die-BackSolving Paint Application Problems: Die-back is a dull, hazy appearance in a repainted finish caused by the topcoat sinking into the undercoat, often from spraying too wet, buffing before full cure, or curing in cold or solvent-contaminated air.
DiluentPaint Mixing, Matching and Applying: A diluent is a liquid that is not a true solvent, added to lower the cost of a paint system.
Dilution RatioPaint Mixing, Matching and Applying: Dilution ratio is the amount of diluent that can be added to a true solvent while the mixture still dissolves a given weight of resin.
Dip CoatingSurface Preparation: Dip coating is applying paint, primer, or sealer by immersing the part in a container of paint, withdrawing it, and allowing the excess to drain.
DispersionPaint Mixing, Matching and Applying: Dispersion is the act of distributing solid particles uniformly throughout a liquid -- commonly, the dispersion of pigment in a paint vehicle.
Distillation RangePaint Mixing, Matching and Applying: Distillation range is the boiling temperature range of a liquid.
Double CoatSpray Gun Operation: A double coat is applied by spraying the first pass left to right and the second pass right to left directly over the first pattern -- two single coats applied one after the other with little or no flash time between them.
DrierPaint Mixing, Matching and Applying: A drier is a chemical added to paint to reduce drying or cure time, and also a system for removing moisture.
Drift PunchVehicle Systems Knowledge: A drift punch is a tool with a long tapered shaft and a flat tip, used to align holes.
DriftingPaint Mixing, Matching and Applying: Drifting is (1) the mixing of two or more colors to achieve the desired final color, or (2) a term used for blending.
Drive SizesVehicle Systems Knowledge: Drive sizes are the fractional sizes of the drive post on sockets -- 1/4, 3/8, 1/2, and 3/4 inch -- with smaller drive sizes used for lighter work such as electrical fasteners.
DropPaint Mixing, Matching and Applying: A portable light on a long electrical cord used to illuminate a work area, such as the underside of a vehicle or the inside of a panel cavity.
Drop LightPaint Mixing, Matching and Applying: Estimating is the analyzing of damage and calculating the cost of repairs.
DryPaint Mixing, Matching and Applying: To dry is to change from a liquid to a solid after a paint liquid has been deposited on a surface.
Dry SandpaperSurface Preparation: Dry sandpaper is abrasive paper used without water, most commonly in coarse to medium grits for shaping and smoothing body filler before priming.
Dry SpraySolving Paint Application Problems: Dry spray is an imperfect coat of paint, usually caused by spraying too far from the surface being painted or onto a surface that is too hot.
Dry StrippingSurface Preparation: The category of paint removal processes that eliminate existing finish using kinetic energy (blast media or mechanical abrasion) rather than chemical strippers - offering the advantage of avoiding chemical waste disposal while achieving complete film removal down to bare substrate.
DryingPaint Mixing, Matching and Applying: Drying is the process of changing a coat of paint from a liquid to a solid state through evaporation of the solvent, a chemical reaction of the binding medium, or a combination of both.
Drying RoomsPaint Mixing, Matching and Applying: A drying room is a dedicated, dust-free enclosure equipped with heat sources such as infrared or quartz lamps that accelerate paint curing and protect fresh finishes from contamination.
DuctilityPaint Mixing, Matching and Applying: Ductility is the property that permits metal to deform under tension without breaking.
DullnessFinish Defects, Causes and Cures: Dullness is a lack of gloss or shine in a finish.
Dust RespiratorSafety Precautions: A dust respirator is a disposable paper or cloth filter mask worn over the nose and mouth to block harmful airborne particles generated by sanding, grinding, and blowing off panels.

E

E-CoatSurface Preparation: E-coat is a cathodic electro-deposition coating process that produces a tough epoxy primer.
Ear ProtectionSafety Precautions: Ear protection -- earplugs or earmuffs -- shields hearing from permanent damage when working around high-decibel tools like air chisels.
EccentricSpray Gun Operation: An eccentric is an offset, cam-like section on a shaft used to convert rotary motion into reciprocating motion -- for example the egg-shaped part on a motor shaft that acts on a diaphragm plate to pull the diaphragm up and down.
Electrical FiresSafety Precautions: Electrical fires occur when excessive current flow overheats wiring until the insulation melts and ignites, commonly caused by short circuits or collision-damaged wiring.
Electro Deposition PrimerSurface Preparation: The factory electrochemical primer process (also called E-coat or cathodic electrodeposition coating) in which the vehicle body is immersed in a paint bath and electrically charged to deposit a uniform, corrosion-resistant primer film into every seam, cavity, and surface of the bare metal structure - providing the OEM corrosion protection baseline that all subsequent repair coatings must match.
ElectrocutionSafety Precautions: Electrocution is a condition in which electricity passes through the human body, causing severe injury or death.
Electrostatic Discharge (ESD)Safety Precautions: A static electricity discharge that can invisibly damage sensitive electronic components, causing latent failures that show up later even though the part looks fine.
Electrostatic SprayingSpray Gun Operation: Electrostatic spraying is the application of paint by high-voltage atomization.
ElementsSurface Preparation: The elements refers to environmental contaminants - moisture, road salt, mud, and similar outdoor substances - that a vehicle is exposed to and that can corrode or damage its parts over time.
EmulsionPaint Mixing, Matching and Applying: An emulsion is a suspension of fine polymer particles in a liquid, usually water.
EnamelPaint Mixing, Matching and Applying: Enamel is a type of automotive paint finish that cures through a chemical reaction rather than solvent evaporation, drying to a high gloss without requiring buffing or polishing.
Endless LinePaint Mixing, Matching and Applying: Endless line is a custom painting technique in which narrow tape is applied in the desired design.
Environmental Protection Agency (EPA)Safety Precautions: The Environmental Protection Agency (EPA) is the U.S. federal regulatory agency established in 1970 that sets and enforces environmental laws governing air quality, hazardous waste, water quality, and toxic substances - with significant impact on automotive collision repair shops through VOC emission limits, hazardous waste disposal requirements, and spray booth regulations.
Environmental SafetySafety Precautions: Environmental safety is the set of procedures that protect people and the environment.
EpoxyPaint Mixing, Matching and Applying: Epoxy is a class of resins characterized by good chemical resistance.
Epoxy Fiberglass FillerPaint Mixing, Matching and Applying: Epoxy fiberglass filler is a waterproof fiberglass reinforcement material used for minor rust repair.
Epoxy PrimerSurface Preparation: Epoxy primer is a two-part primer that cures fast and hard, increasing body filler adhesion and corrosion resistance.
Etch PrimerSurface Preparation: A self-etching primer (also called wash primer) that contains phosphoric acid to simultaneously micro-etch and convert the surface of bare metal substrates - creating mechanical and chemical adhesion while depositing a thin corrosion-inhibiting iron phosphate conversion layer, in a single step that eliminates the need for a separate acid etch or metal conditioner.
EtchingSurface Preparation: Etching is the chemical removal of a layer of base metal to prepare a surface for painting.
Etching PrimerSurface Preparation: Etching primer is a primer formulated to chemically treat and bind directly with bare metal, promoting adhesion before further primer or topcoat layers are applied.
Evaporation RangePaint Mixing, Matching and Applying: Evaporation range is the speed at which a liquid evaporates.
Event Data Recorder (EDR)Legal and Environmental Practices: A vehicle module, often called the vehicle's black box, that records data about a crash event; by law its data belongs to the vehicle owner and generally requires their consent to access.
ExplosionsSafety Precautions: An explosion is a fast-moving air pressure wave resulting from extremely rapid burning, such as igniting fumes near a fuel tank during welding.
Exposure LimitSafety Precautions: An exposure limit is the limit set to minimize occupational exposure to a hazardous substance.
Extender PigmentPaint Mixing, Matching and Applying: An extender pigment is an inert, colorless, semitransparent pigment used in paints to fortify the pigment system and lower its price.
Extension RodPaint Mixing, Matching and Applying: An extension rod is an arm used to connect a lock cylinder to a locking mechanism on a door latch assembly.
ExtensionsVehicle Systems Knowledge: A socket extension is a straight bar that connects between a ratchet handle and a socket to provide the reach needed to access recessed or obstructed fasteners.
ExteriorPaint Mixing, Matching and Applying: Exterior refers to the outside area of the vehicle.
External-Mix GunSpray Gun Operation: An external-mix gun is a paint spray gun that mixes and atomizes the air and paint outside the air cap.
Eye BathSafety Precautions: An eye bath is a device used to flood the eyes with water in case of accidental contact with a chemical or other hazardous material.
Eye Flushing StationSafety Precautions: An eye flushing station is a safety fixture that delivers a steady flow of fresh water through nozzles to irrigate the eyes immediately after chemical or particle exposure, required to be within 10 seconds or 55 feet of any potential hazard.

F

Face ShieldSafety Precautions: A face shield is a device worn to protect the face and eyes from airborne hazards and chemical splashes, and during dangerous operations to protect the face from deep lacerations.
Fan PatternSpray Gun Operation: Fan pattern is the width of a spray gun's spray shape, controlled by the fan pattern knob (spreader adjustment), set wider for large areas and narrower for small or detail work.
FanningSolving Paint Application Problems: Fanning is the use of pressurized air through a paint spray gun to speed up the drying time of a finish.
Fastened PartsVehicle Systems Knowledge: Fastened parts are parts held onto a vehicle by bolts, nuts, screws, clips, and adhesives.
FastenersVehicle Systems Knowledge: Fasteners are the mechanical and adhesive devices - including bolts, nuts, screws, clips, and structural adhesives - that secure every component of a vehicle to the body, frame, and chassis.
Fatigue FailureVehicle Systems Knowledge: Fatigue failure is a metal failure resulting from repeated stress that alters the character of the metal so that it cracks.
FeatherSurface Preparation: To feather is to taper the edge of a damaged area with sandpaper or a special solvent, creating a gradual transition from the base metal through the paint layers to the topcoat.
Feather, Fill and BlockSurface Preparation: A three-step surface preparation sequence in which the painter tapers the broken paint edge around a repair area, applies primer-surfacer to fill scratches, then block sands the primed area flat and smooth before applying color coats.
Featheredge SplittingSurface Preparation: Featheredge splitting refers to stretch marks or cracks along a featheredge that occur during drying or shortly after topcoat is applied over a primed surface.
FeatheredgingSurface Preparation: Featheredging is the sanding process of tapering the edges of paint layers and body filler outward in progressively finer gradients to create a smooth, level transition from the repair area to the surrounding undamaged finish.
Federal Motor Vehicle Safety Standard (FMVSS)Legal and Environmental Practices: The set of federal standards that test and regulate vehicle safety performance, including how OEM glass and structural components perform in a crash.
Film BuildSurface Preparation: Film build is the total accumulated thickness of paint layers on a surface, measured in mils, which must stay within manufacturer limits to avoid cracking and other defects.
Film FormationPaint Mixing, Matching and Applying: Film formation is the change of a coat of paint from a liquid to a solid state, through evaporation of the solvent, a chemical reaction of the binder, or a combination of both.
Final DetailingPaint Mixing, Matching and Applying: Final detailing is the concluding series of cleaning, polishing, and finishing steps performed on a repaired vehicle to restore it to showroom-quality condition before delivery to the customer.
Final SandingSurface Preparation: Final sanding is the last surface preparation operation before applying paint, using fine to very fine abrasive grits to remove primer imperfections and create the smooth, scuff-profile surface needed for topcoat adhesion.
Fine Line Masking TapePaint Mixing, Matching and Applying: Fine line masking tape is a thin, flexible plastic adhesive tape used to create precise, sharp paint break lines along body edges, trim, and moldings that cannot be removed before painting.
Finish SandingSurface Preparation: Finish sanding is the last stage of hand sanding an old finish, and the sanding of primer-surfacer using 400 grit or finer -- using fine and very fine grits to prepare body surfaces for painting.
Fire ExtinguisherSafety Precautions: A fire extinguisher is a metal tank filled with a chemical agent designed to quickly smother and stop a fire by depriving it of heat, fuel, or oxygen.
First-Aid KitSafety Precautions: A first-aid kit is a required shop safety supply containing sterile gauze, bandages, antiseptics, scissors, and other medical items needed to treat minor injuries such as cuts and burns on the job.
Fish-Eye EliminatorSolving Paint Application Problems: A fish-eye eliminator is an additive that makes paint less likely to show fish-eye -- an agent that helps the paint smooth over small craters or holes. Because it is oil-based, it changes the material it is added to.
Fish-EyesSolving Paint Application Problems: Fish-eyes are small crater-like openings in a paint finish caused by oil or silicone surface contamination that repels the paint as it's applied.
FlamesPaint Mixing, Matching and Applying: Flames are a flame-like design produced through the use of stencils and paint.
FlashPaint Mixing, Matching and Applying: Flash is the first stage of drying, where some of the solvents evaporate and the surface dulls from an exceedingly high gloss.
Flash PointSafety Precautions: The minimum temperature at which a flammable liquid's vapor will ignite upon contact with an ignition source. Understanding flash point is required for safe handling, storage, and regulatory compliance of all solvents and thinners used in the collision shop.
Flash TimePaint Mixing, Matching and Applying: Flash time is the required waiting period between coats of sprayed paint or primer that allows solvents to partially evaporate so the next coat can be applied without causing runs, sags, or lifting.
FlatPaint Mixing, Matching and Applying: Flat is the lack of gloss or shine in a finish.
FlattenerPaint Mixing, Matching and Applying: A flattener is an additive that reduces the gloss of a finishing material.
Flex AdditivePaint Mixing, Matching and Applying: A flexibilizing polymer additive blended into topcoat paint formulas at the mixing stage to increase the cured film's elongation percentage - allowing the finished coating on flexible plastic substrates (bumper fascias, flexible cladding) to deflect and recover with the substrate without cracking.
Floor JackSafety Precautions: A floor jack is portable equipment used to lift a vehicle, using a saddle to raise the front, sides, or rear.
FlowPaint Mixing, Matching and Applying: Flow is the leveling characteristic of a wet paint film -- the ability of a liquid to run evenly over a surface and leave a smooth film behind.
Flow Control KnobSpray Gun Operation: The flow control knob adjusts the amount of paint or other material that flows from the spray gun by controlling how far the fluid needle retracts from the nozzle when the trigger is pulled.
Fluid Adjustment ScrewSpray Gun Operation: The fluid adjustment screw is a spray gun control that regulates the amount of material passing through the fluid tip as the trigger is depressed.
Fluid Control KnobSpray Gun Operation: The fluid control knob is a spray gun adjustment that regulates how far the fluid needle opens when the trigger is pulled, controlling the volume of paint or material delivered with each pass.
Fluid Control ValveSpray Gun Operation: The fluid control valve is a manual spray gun adjustment used to determine the amount of paint coming from the gun.
Fluid NeedleSpray Gun Operation: The fluid needle is a spray gun valve component that shuts off the flow of material.
Fluid TipSpray Gun Operation: The fluid tip is the spray gun nozzle that meters the paint and directs it into the air stream.
Foam Backing PadSurface Preparation: A foam backing pad is used when power sanding crowned surfaces, or for extra-fine final sanding.
Foam Masking TapePaint Mixing, Matching and Applying: Foam masking tape (aperture tape) is a self-adhesive foam rubber cord inserted behind doors, hoods, and panel openings to block overspray from penetrating into the panel gaps during blend repairs.
Fog CoatSolving Paint Application Problems: A fog coat is a paint coat applied following a wet coat in which mottling or streaking occurs.
Force DryingPaint Mixing, Matching and Applying: Force drying is a means of reducing the waiting time between coats, using spray booth heat convection or infrared heat.
Force-DrySpray Gun Operation: Force-drying is the use of applied heat -- infrared lamps, UV lamps, or heated airflow -- to speed the curing of freshly sprayed paint.
Free Air CapacitySpray Gun Operation: Free air capacity is the actual amount of free air available at the compressor's working pressure.
Frisket PaperPaint Mixing, Matching and Applying: Frisket paper is an adhesive-backed paper used as stencil material.
FrostingFinish Defects, Causes and Cures: Frosting is the formation of a surface haze -- a defect in a drying paint film -- and also the freezing of surface moisture on a line or component.
Full Face ShieldSafety Precautions: A full face shield is a head-mounted safety device that covers the entire face from forehead to chin, protecting the eyes, face, and neck from flying debris, sparks, grinding particles, and chemical splashes.
Full Wet CoatPaint Mixing, Matching and Applying: A full wet coat is a heavy application of finish used to thoroughly cover the substrate, produced by moving the spray gun slightly more slowly than normal.

G

Galvanized MetalSurface Preparation: Galvanized metal is metal that has been coated with zinc.
GalvanizingSurface Preparation: Galvanizing is the process of coating steel with zinc.
GlazeFinish Defects, Causes and Cures: Glaze is a fine polishing product, applied by hand or machine, used as the final step to eliminate swirl marks left by buffing.
Glazing PuttySurface Preparation: Glazing putty is a paste-like material used to fill small surface pits or flaws.
Globally Harmonized System (GHS)Safety Precautions: The international standard for classifying chemical hazards and their labeling symbols, used alongside or in place of systems like WHMIS.
GlossPaint Mixing, Matching and Applying: Gloss is the ability of a surface to reflect light, measured as the percentage of light reflected from the surface at certain angles.
Gloss LevelPaint Mixing, Matching and Applying: Gloss level is the amount of shine remaining on a paint surface.
GogglesSafety Precautions: Goggles are sealed safety eyewear that fits tightly against the face to protect the eyes from chemical splashes, solvent vapors, and welding torch glare, providing a level of coverage that safety glasses alone cannot achieve.
Gravity FeedSpray Gun Operation: A spray gun design in which the paint cup is mounted on top of the gun body, allowing gravity to deliver material from the cup downward to the fluid needle and air cap - the dominant configuration for HVLP spray guns used in automotive refinishing.
Gravity-fed Spray GunSpray Gun Operation: A gravity-fed spray gun provides a consistent, spatter-free method of feeding liquid into the gun, used for spot, panel, and overall refinish work.
Grinding DiscsSurface Preparation: Grinding discs are round, very coarse abrasives used for preliminary removal of paint, plastic, and metal.
GritSurface Preparation: Grit is the standardized measurement of abrasive particle size on sandpaper or sanding discs, where lower numbers indicate coarser (larger) particles for fast cutting and higher numbers indicate finer particles for smoothing.
Grit Numbering SystemSurface Preparation: The grit numbering system is the standardized classification that assigns numerical values to abrasive particle sizes, with lower numbers representing coarser abrasives and higher numbers representing finer abrasives across a range from about 16-grit to 3,000-grit.
Ground WireSurface Preparation: A ground wire is a metal wire connected between the vehicle body and an earth ground to discharge static electricity before painting.
Guide CoatSurface Preparation: A guide coat is a thin reference coat of a different color -- or a special powder -- applied over a primer-surfacer and sanded off to reveal high and low spots and confirm the panel is straight.
Gun AnglePaint Mixing, Matching and Applying: Gun angle is how squarely the spray gun is held relative to the panel surface; an inconsistent angle causes heeling, an uneven spray pattern common on curved panels like hoods and roofs.
Gun ArcPaint Mixing, Matching and Applying: Gun arc is keeping the spray gun at a uniform distance from the panel throughout the spray stroke, following the panel's curve; a lapse into swinging the gun in a true arc motion causes an arcing defect.
Gun DistancePaint Mixing, Matching and Applying: Gun distance is the spacing kept between the spray gun and the panel surface while spraying, typically about 6-10 inches, and one of the core variables in proper spray technique.
Gun SpeedPaint Mixing, Matching and Applying: Gun speed is how fast the spray gun moves across the panel while spraying, typically around one foot per second, balanced against gun distance and material flow to control coat thickness.

H

Halo EffectFinish Defects, Causes and Cures: A halo effect is a finish defect appearing as a shiny circular ring around a pearl or mica spot repair, caused by uneven paint wetness between the center and the blend edges of the repair.
Hand Rubbing CompoundPaint Mixing, Matching and Applying: Hand rubbing compound is a rubbing compound formulated for manual use only, as distinct from a machine-application compound.
Hard HatSafety Precautions: A hard hat is metal or plastic headgear worn to help protect the head from abrasions, hot sparks, and chemical sprays.
HardenerPaint Mixing, Matching and Applying: A hardener is a curing agent used in certain plastics and epoxies.
HardwareVehicle Systems Knowledge: Hardware means the hinges, hangers, and fasteners used in vehicle construction -- and, in a computing context, the physical equipment such as computers, printers, and drives.
HarnessPaint Mixing, Matching and Applying: A harness is a bundle of electrical wires and cables tied together as a single unit.
Hazard Communication StandardSafety Precautions: The OSHA regulation requiring a complete chemical inventory and hazard warnings for every hazardous substance used in the shop.
Hazardous MaterialSafety Precautions: A hazardous material is any material that can cause serious physical harm, endanger human health if handled or disposed of improperly, or pose a risk to the environment and waterways.
Hazardous Materials Identification System (HMIS)Safety Precautions: A U.S. chemical hazard labeling system that uses numeric fire, health, and reactivity ratings; its fire rating codes may appear on a label but aren't a universally required element the way OSHA/WHMIS hazard warnings are.
Hazardous WasteSafety Precautions: Hazardous waste is any solid or liquid material classified by the EPA as harmful to people or the environment due to characteristics of ignitability, corrosivity, reactivity, or toxicity, requiring special handling and disposal in the collision shop.
HazeFinish Defects, Causes and Cures: Haze is the development of a cloud in a film or in a clear liquid.
Health and Safety at Work Act (HASAWA)Safety Precautions: The United Kingdom's foundational workplace health and safety law, which applies to every employee and employer regardless of seniority.
Heat CrayonPaint Mixing, Matching and Applying: A heat crayon is a thermal-sensing paint stick used to determine the temperature of aluminum or other metal being heated.
HeelingSpray Gun Operation: Heeling is a spray gun technique error in which the gun is tilted rather than held perpendicular to the panel surface, causing uneven paint film thickness, dry spray on one side of the pattern, and orange peel.
Hiding PowerPaint Mixing, Matching and Applying: A paint's ability to cover and obscure the color and texture of the surface beneath it, so the substrate or old color no longer shows through the finished topcoat.
High-Efficiency Particulate Air (HEPA)Safety Precautions: A high-efficiency air filter used in vacuums to safely capture extremely fine hazardous dust, such as asbestos or fiberglass particles, without releasing it back into shop air.
High-Volume, Low-Pressure (HVLP)Spray Gun Operation: A spray gun technology that delivers paint at low air pressure (approximately 10 psi at the air cap), producing minimal overspray and reduced VOC emissions. Required by law in most U.S. states for automotive refinishing operations.
Hold OutSurface Preparation: Hold out is the ability of a surface to keep the topcoat from sinking in.
Hot SpraySpray Gun Operation: Hot spray is a technique of applying heated paint.
HotspotSurface Preparation: A hotspot is an unprotected area that may be subject to corrosion.
HSSVehicle Systems Knowledge: HSS is an abbreviation for high-strength steel.
HuePaint Mixing, Matching and Applying: Hue is the visual characteristic by which one color differs from another -- red, blue, green, and so forth.
HumidityPaint Mixing, Matching and Applying: Humidity is the amount of water vapor in the air.
Hydraulic LiftSafety Precautions: A hydraulic lift is a shop equipment system that uses pressurized fluid to raise a vehicle off the ground for undercarriage access, requiring proper vehicle positioning at designated lift points to prevent tipping or structural damage.
HydrocarbonLegal and Environmental Practices: A hydrocarbon is a compound that contains carbon and hydrogen.

I

I-CAR (Inter-Industry Conference on Auto Collision Repair)Safety Precautions: The collision industry's primary not-for-profit training and certification organization, whose Gold Class and role-specific programs define baseline technical competency for technicians, estimators, and shop owners across the collision repair industry.
IgnitabilitySafety Precautions: Ignitability is an EPA hazardous waste characteristic identifying liquids with a flash point below 140°F, or solids capable of spontaneous ignition.
Impact ToolVehicle Systems Knowledge: An impact tool is an electric or pneumatic hand tool used to tighten or loosen bolts and nuts.
Impact WrenchVehicle Systems Knowledge: An impact wrench is an electrically or pneumatically driven hand tool used for rapidly turning nuts and bolts to tighten or loosen them.
Impervious GlovesSafety Precautions: Impervious gloves are latex or synthetic rubber gloves worn to prevent skin exposure when working with harmful chemicals.
Industrial FalloutFinish Defects, Causes and Cures: Surface contamination caused by small, airborne particles of iron that fall on and stick to the vehicle's paint finish, most often near rail yards, foundries, or heavy industrial areas.
Infrared BakingSpray Gun Operation: Infrared baking is the drying of a paint film using heat developed by an infrared source -- an electrical heating element that emits radiant energy for drying or curing automotive finishes.
Infrared LampSpray Gun Operation: An infrared lamp is a heat source used to force-dry paint, available in configurations that cure from the substrate up (bottom up) or from the outer surface in (top down).
InhibitorPaint Mixing, Matching and Applying: An inhibitor is an additive for paint that slows gelling, skinning, or yellowing, or a chemical applied to steel to retard rusting and oxidation.
Inline OilerSpray Gun Operation: An inline oiler is an air line fitting that automatically introduces a metered amount of oil into the compressed air stream to lubricate air-powered tools, and must never be installed on lines connected to spray guns.
Insurance Institute for Highway Safety (IIHS)Legal and Environmental Practices: An independent vehicle safety rating organization whose testing standards (such as for roof strength) are separate from and different than NHTSA's.
Intake Air FilterSpray Gun Operation: The intake air filter is the filter element mounted at the compressor inlet that removes dust and fine particles from all incoming air before it enters the compressor, protecting both the compressor internals and the spray gun air supply.
Internal Rust-OutSurface Preparation: Internal rust-out is rust damage caused by oxidation working from the inside of a panel outward, occurring when rust is allowed to erode through a metal panel.
International Autobody Congress And Exposition (NACE)Legal and Environmental Practices: NACE is the International Autobody Congress and Exposition, the collision repair industry's trade event, named in the source material alongside I-CAR and the industry trade associations.
International System Of Units (SI)Vehicle Systems Knowledge: SI stands for the International System of Units, and the letters SI are the marking that identifies metric threads, which come in both coarse and fine.
IronVehicle Systems Knowledge: Iron is a basic element.
ISOSafety Precautions: The International Organization for Standardization - an independent international body that publishes technical standards adopted by industries worldwide, including automotive manufacturing quality, environmental management, and repair procedure specifications.
ISO CodePaint Mixing, Matching and Applying: The ISO code is an International Standards Organization identification code molded into a plastic part that identifies the specific type of plastic used to make it.
IsocyanateSafety Precautions: A reactive chemical compound released during the mixing and spraying of two-component urethane paints and clearcoats. Classified as a hazardous respiratory sensitizer, it requires painters to use a supplied-air respirator and full PPE during application.
Isopropyl AlcoholSurface Preparation: Isopropyl alcohol is a solvent that dissolves grease, oil, and wax without harming paint finishes or plastic surfaces.

J

JackSafety Precautions: A jack is a device used for heavy lifting, such as lifting a vehicle.
Jack StandsSafety Precautions: Jack stands are rigid, height-adjustable steel supports placed under a raised vehicle to hold it safely after lifting with a floor jack, preventing the vehicle from falling if the jack fails.
JitterbugSurface Preparation: A jitterbug is an air-powered orbital sander used for dry or wet sanding paint, offering an alternative to a DA sander for surface preparation work.
JouncePaint Mixing, Matching and Applying: Jounce is the compression of a spring caused by an upward movement of the wheel and/or a downward movement of the frame.

K

Kick-OutSolving Paint Application Problems: Kick-out is the precipitation of dissolved binder out of a solution as a result of solvent incompatibility.
KilogramPaint Mixing, Matching and Applying: A kilogram is a unit of mass in the SI metric system.
KilometerPaint Mixing, Matching and Applying: A kilometer is a unit of distance in the SI metric system.

L

Lace PaintingPaint Mixing, Matching and Applying: Lace painting is a stencil painting technique in which paint is sprayed over fabric lace designs stretched across the surface to be decorated.
LacquerPaint Mixing, Matching and Applying: Lacquer is a type of paint that dries by solvent evaporation and can be rubbed to improve its appearance.
Leader HoseSpray Gun Operation: A leader hose is a short length of air hose with quick coupler connections, used to connect pneumatic tools to the shop air supply.
LeadingPaint Mixing, Matching and Applying: Leading is the act of applying a lead-based solder body filler.
Leaking Spray GunSpray Gun Operation: A leaking spray gun is a spray equipment malfunction in which paint seeps or drips from the gun body, lid, or cup outside the spray pattern, contaminating the work surface and wasting material.
Let Down PanelPaint Mixing, Matching and Applying: A test spray-out panel used specifically for pearl and multi-coat color matching, in which the basecoat, pearl/mica midcoat, and clearcoat are applied in progressively reduced layers (let down) across zones of the panel - allowing the refinisher to identify which layer combination matches the vehicle's existing finish at the exact viewing angle.
Let-Down Test PanelPaint Mixing, Matching and Applying: A let-down test panel is a test spray-out card used when matching three-stage and multistage paint systems, showing the color produced by progressively fewer mid-coat and basecoat layers so the painter can identify the correct coat count before painting the vehicle.
Liability InsuranceLegal and Environmental Practices: Liability insurance is insurance that covers the policyholder for damages to the personal property of others.
LiftSafety Precautions: A lift is a hydraulic mechanism used to raise a vehicle off the floor.
LiftingFinish Defects, Causes and Cures: Lifting is a paint finish defect characterized by surface distortion, wrinkling, or shriveling of the topcoat caused by solvents in the new finish attacking and swelling an incompletely cured or incompatible underlying coat.
Light CoatPaint Mixing, Matching and Applying: A light coat is a thin paint application produced by moving the spray gun faster than normal across the panel surface, depositing less material per pass, and used for initial basecoat coverage and dusty first coats before building to full wet film.
Light Emitting Diode (LED)Surface Preparation: A solid-state artificial light source; less accurate for color evaluation than natural sunlight, similar to other artificial light sources.
LightnessPaint Mixing, Matching and Applying: Lightness is the whiteness of a paint, measured by the amount of light reflected off its surface.
Line CheckingFinish Defects, Causes and Cures: Line checking is similar to cracking, but the lines or cracks are more parallel and range from very short to very long.
Liquid MaskSurface Preparation: Liquid mask is a sprayable, water-removable coating applied to a vehicle to protect areas from overspray during refinishing, offered as an alternative to paper-and-tape masking.
Liquid SandpaperSurface Preparation: Liquid sandpaper is a chemical that cleans and etches a paint surface.
LiterPaint Mixing, Matching and Applying: A liter is a unit of volume in the SI metric system.
Lockout/Tagout (LOTO)Safety Precautions: A safety procedure that physically disables and labels energized equipment (from a high-voltage vehicle system to shop machinery or an electrical breaker) to prevent it from being energized while a technician is servicing it.
Lumen RatingPaint Mixing, Matching and Applying: Lumen rating is the measure of total visible light output from a lamp, expressed in lumens, used when selecting spray booth and color-matching lighting to ensure adequate brightness for accurate paint color evaluation.
LVLPSpray Gun Operation: LVLP (low volume, low pressure) is a spray gun type that uses reduced air volume and pressure, offered as an alternative to HVLP depending on regional regulations and shop preference.

M

Machine CompoundsFinish Defects, Causes and Cures: Machine compounds are abrasive polishing products formulated to be applied with a rotary or dual-action polisher, designed to withstand the heat and friction of machine application while removing paint defects, orange peel, and light scratches from the finished surface.
Machine GuardSafety Precautions: A machine guard is a safety device used to prevent a person from coming into contact with the moving parts of a machine.
Manufacturer's InstructionsSafety Precautions: Manufacturer's instructions are the official product use, safety, and application procedures provided by a product manufacturer - printed on labels for paint and chemicals, and in manuals for equipment - that must be followed to ensure correct results and safe use.
MaskingSurface Preparation: Masking is the process of covering all vehicle surfaces, glass, trim, and components adjacent to the area being painted with masking tape, paper, and plastic to protect them from paint overspray.
Masking LiquidSurface Preparation: Masking liquid (masking coating) is a sprayable water-based or solvent-based material applied over body panels and glass to form a temporary paint-proof film that protects the vehicle from overspray and is removed after painting.
Masking MaterialsSurface Preparation: Masking materials are the collection of tapes, papers, plastics, and coatings used to cover and protect all surfaces adjacent to a paint repair area from overspray contamination.
Masking PaperSurface Preparation: Masking paper is a special paper that will not permit paint to bleed through, used to protect areas from overspray.
Masking PlasticSurface Preparation: Masking plastic is a lightweight plastic sheeting sold in rolls used to cover large vehicle areas and glass from paint overspray, applied away from the actual spray zone because its electrostatic charge attracts overspray mist.
Masking RopeSurface Preparation: Masking rope is a self-adhesive foam rubber cord used to quickly seal off gaps and recessed areas behind panels during masking, keeping overspray out of spaces that flat masking paper and tape can't reach.
Masking TapeSurface Preparation: Masking tape is a high-tack, easy-to-tear paper tape used to hold masking paper and plastic in position during painting, with fine line masking tape being a thin plastic variant used to create precise, clean paint edges directly at the painted boundary.
Material Safety Data Sheet (MSDS)Safety Precautions: A Material Safety Data Sheet (MSDS) is data available from all product manufacturers detailing chemical composition and precautionary information for any product that can present a health or safety hazard.
Mechanical FastenerVehicle Systems Knowledge: A mechanical fastener is a device -- such as screws, nuts, bolts, rivets, and spring clips -- used for the adjustment and replacement of assemblies or components.
MechanismVehicle Systems Knowledge: A mechanism is the working parts of an assembly.
Medium Wet CoatSpray Gun Operation: A paint coat produced by moving the spray gun across the surface at a normal, standard travel speed, giving a moderate film build between a light tack coat and a heavier full wet coat.
Membrane DryerSpray Gun Operation: A compressed air purification device that uses a semipermeable polymer membrane to selectively pass dry air while blocking water vapor and oil aerosols - providing a maintenance-free, continuous-use alternative to desiccant dryers for point-of-use compressed air conditioning at the spray gun.
Metal ConditionerSurface Preparation: Metal conditioner is a phosphoric acid-based chemical wash applied to bare metal before priming to remove rust and corrosion, etch the surface for improved primer adhesion, and convert iron oxide into a stable compound that inhibits further rusting.
Metal TreatingSurface Preparation: Metal treating is a four-step process for ensuring long-term corrosion resistance of body panels and other metal parts.
Metallic PaintPaint Mixing, Matching and Applying: Metallic paint is a topcoat finish containing small aluminum or polyester reflective flakes suspended in the paint medium that sparkle in sunlight and create a color effect that changes with viewing angle and paint film thickness.
MetallurgyVehicle Systems Knowledge: Metallurgy is the study of metals and the technology of metals.
MetamerismPaint Mixing, Matching and Applying: Metamerism describes two or more colors that match when viewed under one light source but do not match when viewed under a second light source.
Methyl Ethyl Ketone Peroxide (MEKP)Safety Precautions: An organic peroxide catalyst used to cure fiberglass resin; it is extremely irritating to skin and can cause chemical burns if not washed off immediately.
MicaPaint Mixing, Matching and Applying: Mica is a color pigment or particle found in pearl paints.
MilPaint Mixing, Matching and Applying: A mil is a measure of paint film thickness equal to one one-thousandth of an inch.
MildewFinish Defects, Causes and Cures: Mildew is a fungus growth that appears in warm, humid areas.
Mineral SpiritsSurface Preparation: Mineral spirits is a petroleum-based product with about the same evaporation rate as gum turpentine, used for wet sanding and for cleaning spray guns.
Minor Body DamagePaint Mixing, Matching and Applying: Minor body damage describes a vehicle that only requires a few parts to be replaced or repaired before being repainted.
MisciblePaint Mixing, Matching and Applying: Miscible means capable of being mixed.
MistSpray Gun Operation: Mist is liquid droplets suspended in air, formed either by condensation from vapor to liquid or by breaking a liquid into a dispersed state through atomization.
Mist CoatPaint Mixing, Matching and Applying: A mist coat is a light spray coat of high-volume solvent used for blending or gloss enhancement, produced by moving the spray gun a little more quickly than normal.
Mixing by PartsPaint Mixing, Matching and Applying: Mixing by parts is a paint mixing method in which materials are combined in ratios expressed as proportional parts (e.g., 4:1:1 paint-to-hardener-to-reducer) rather than by percentage, allowing any desired batch size to be mixed accurately.
Mixing ChartPaint Mixing, Matching and Applying: A mixing chart is a reference table that converts paint material mixing ratios and percentages into the specific measured amounts (in ounces, parts, or graduated container markings) needed to mix a correct batch of two-part paint, primer, or clear.
Mixing ScalePaint Mixing, Matching and Applying: A mixing scale is a precision weighing device used at the paint mixing station to measure each paint component (pigments, binder, reducer, hardener) by weight according to the manufacturer's formula, ensuring accurate color reproduction and correct material ratios.
Mixing StickPaint Mixing, Matching and Applying: A mixing stick is a marked measuring tool used to ensure the correct proportional ratio of paint, reducer, and hardener when a manufacturer specifies mix ratios rather than a weighed formula.
Mold Release CompoundPaint Mixing, Matching and Applying: Mold release compound is a chemical residue, sometimes water-soluble and sometimes solvent-soluble, left on some molded plastic parts that prevents paint adhesion if not fully removed.
MoleculePaint Mixing, Matching and Applying: A molecule is the smallest possible unit of a substance that still retains the characteristics of that substance.
MottlingFinish Defects, Causes and Cures: Mottling is a paint film defect that appears as blotches or surface imperfections.
Movable SectionVehicle Systems Knowledge: A movable section is a component held in position by a mechanical fastener.

N

National Automotive Technicians Education Foundation (NATEF)Legal and Environmental Practices: NATEF is the nonprofit foundation created to evaluate automotive training programs and formally recognize the ones that meet its standards.
National Emission Standards for Hazardous Air Pollutants (NESHAP)Legal and Environmental Practices: The federal National Rule that sets the minimum VOC and application-technique requirements every automotive refinishing facility in the U.S. must meet.
National Fire Protection Association (NFPA)Safety Precautions: The organization behind the NFPA 704 hazard diamond, which uses color-coded quadrants to rate a material's health, flammability, and reactivity hazards on a 0-4 scale.
National Highway Traffic Safety Administration (NHTSA)Legal and Environmental Practices: The federal agency that sets and regulates motor vehicle safety standards.
National Institute For Automotive Service Excellence (NIASE)Legal and Environmental Practices: NIASE is the original name of the certifying body that later shortened its name to ASE -- the organization that writes and administers the automotive technician certification tests.
National Institute for Occupational Safety and Health (NIOSH)Safety Precautions: The National Institute for Occupational Safety and Health (NIOSH) is the U.S. federal research agency within the CDC that conducts research and makes recommendations to prevent work-related illnesses and injuries - most relevant to collision repair through its approval and testing of respiratory protection equipment.
NegligentLegal and Environmental Practices: Negligent means careless or irresponsible.
NeutralizerSurface Preparation: A neutralizer is a material used to chemically remove any trace of paint remover before refinishing begins.
NibFinish Defects, Causes and Cures: The targeted defect correction procedure of spot-sanding individual dirt nibs or dust particles embedded in the topcoat - using a nib block or small sanding disc on just the contamination point rather than flat-sanding the entire panel surface - followed by buffing to restore gloss.
Nib SandingSurface Preparation: Nib sanding is a light, targeted sanding technique used to remove small imperfections -- nibs, dirt specks, or dried overspray -- from a paint surface without sanding the entire panel.
Nitrile GloveSafety Precautions: Nitrile gloves are gloves used for protection when working with paints, solvents, catalysts, and fillers.
Nonferrous MetalVehicle Systems Knowledge: A nonferrous metal is a metal that contains no iron -- such as aluminum, brass, bronze, copper, lead, nickel, and titanium.

O

Occupational Safety and Health Administration (OSHA)Safety Precautions: The Occupational Safety and Health Administration (OSHA) is the U.S. federal agency within the Department of Labor that sets and enforces mandatory workplace safety and health standards, conducts inspections, and imposes penalties for non-compliance - governing the working conditions of every collision repair shop in the United States.
OEM Color VariancePaint Mixing, Matching and Applying: OEM color variance is the measurable color difference that exists between vehicles of the same make, model, and color code due to normal manufacturing variation in pigment batches, spray equipment settings, and environmental conditions at the factory - requiring refinishers to evaluate and adjust color formulas rather than simply matching by code.
OpaquePaint Mixing, Matching and Applying: Opaque means not transparent, or impervious to light.
Orange PeelFinish Defects, Causes and Cures: Orange peel is an irregularity in a paint film that appears as an uneven, dimpled surface but feels smooth to the touch, resulting from the wet film's inability to level out after application.
Orbital SanderSurface Preparation: An orbital sander is a hand-held power sanding tool that operates in an elliptical or oval pattern.
OrificeSpray Gun Operation: An orifice is a small calibrated opening.
Original FinishPaint Mixing, Matching and Applying: Original finish is the paint applied by the vehicle manufacturer.
Outside Surface RustPaint Mixing, Matching and Applying: Outside surface rust is rust that starts on the outside of a panel, rather than originating from hidden internal corrosion.
OvenSpray Gun Operation: An oven is equipment used to bake on a finish -- to cure a coating with heat after application.
OverspraySolving Paint Application Problems: Overspray is paint that lands on a surface that was not intended to be painted, ranging from a light dusting to a full coat, caused by inadequate masking or covering of nearby surfaces.

P

Pad Spur ToolFinish Defects, Causes and Cures: A pad spur tool is a tool with a star wheel used to clean and fluff up a wool buffing pad before machine compounding.
PaintPaint Mixing, Matching and Applying: Paint is the visible topcoat of color on a vehicle.
Paint BakingSpray Gun Operation: Paint baking is curing paint at approximately 160°F (72°C) for 15 to 20 minutes.
Paint BinderPaint Mixing, Matching and Applying: The paint binder is the film-forming component of a paint that holds pigment particles together, adheres the paint to the surface, and determines the paint type (lacquer, enamel, urethane) based on its chemical drying mechanism.
Paint ChalkingFinish Defects, Causes and Cures: Paint chalking is a finish defect and age-related deterioration condition in which the surface loses gloss and develops a powdery or dull appearance as ultraviolet radiation breaks down the paint binder and releases pigment to the surface.
Paint CodePaint Mixing, Matching and Applying: A paint code is an alphanumeric code stating the type and color of paint used during vehicle manufacturing.
Paint Color DirectoryPaint Mixing, Matching and Applying: A paint color directory is a reference book published by a paint manufacturer that contains color chips, mixing formulas, and tinting instructions organized by vehicle make, model, and year to assist the technician in identifying and mixing the correct paint color.
Paint Color MismatchPaint Mixing, Matching and Applying: A visible color difference between the repaired panel and the surrounding original finish, most often caused by an inaccurate color match, mixing error, or inconsistent application technique.
Paint Fish-EyesFinish Defects, Causes and Cures: Paint fish-eyes are circular dimples or craters in the wet paint film caused by surface contamination (primarily silicone from wax or polish) that repels the paint and pushes it outward from the contaminated spot.
Paint Flex AdditivePaint Mixing, Matching and Applying: A paint flex additive is a liquid additive mixed into topcoat, primer, or clear before application to flexible plastic substrates, keeping the cured paint film soft and pliable enough to flex with the panel without cracking.
Paint FormulaPaint Mixing, Matching and Applying: A paint formula gives the percentage of each ingredient needed to match an original equipment manufacturer color on the vehicle.
Paint Masking PaperSurface Preparation: Paint masking paper is a polycoated, nonporous masking paper designed specifically for use adjacent to topcoat paint application, providing bleed-through resistance and a lint-free surface that prevents overspray contamination of protected areas.
Paint MottlingFinish Defects, Causes and Cures: Paint mottling is a metallic paint finish defect in which aluminum flakes cluster together in groups during drying, producing a blotchy, streaked, or silvery cloud-like pattern in the finished color instead of a uniform metallic distribution.
Paint ProtrusionFinish Defects, Causes and Cures: A paint protrusion is a contamination defect in which a particle of dust, dirt, or lint embedded in the wet paint dries into the film, creating a raised bump on the paint surface that must be sanded and polished to restore a smooth finish.
Paint RunsFinish Defects, Causes and Cures: Paint runs are streaks or curtains of excess paint that flow downward on a vertical panel surface caused by applying too much material, too slow a gun pass, insufficient flash time, or incorrect solvent speed.
Paint SealerSurface Preparation: A paint sealer is an intermediate coat applied between the primer and topcoat to prevent topcoat solvents from bleeding through and discoloring the new finish, and to improve adhesion and color uniformity.
Paint ShakersPaint Mixing, Matching and Applying: Paint shakers are mechanical vibrating machines used to thoroughly mix paint cans before opening by shaking them vigorously, ensuring uniform suspension of pigments, metallic flakes, and additives that settle during storage.
Paint SolventPaint Mixing, Matching and Applying: Paint solvent is the volatile liquid carrier in a paint formulation that dissolves or suspends the pigment and binder to achieve a sprayable consistency, then evaporates after application as the paint film forms.
Paint StripperSurface Preparation: Paint stripper is a powerful chemical solvent applied to a vehicle panel to dissolve and lift the existing paint film, used when the old finish is too deteriorated for sanding to provide an adequate substrate for refinishing.
Paint ThicknessSurface Preparation: Paint thickness is the measurement of how much paint exists on a vehicle panel, expressed in mils (thousandths of an inch). OEM finishes average 4-8 mils; exceeding about 12 mils can cause adhesion and cracking problems.
Paint WrinklingFinish Defects, Causes and Cures: Paint wrinkling is a severe surface defect in which the paint film puckers into a wrinkled texture resembling prune skin, most commonly occurring with enamel paints that are not allowed to cure properly.
Paint-Safe MarkerFinish Defects, Causes and Cures: A paint-safe marker is a marking tool specifically formulated to identify surface defects in fresh automotive paint without damaging or contaminating the finish.
Panel RepairsPaint Mixing, Matching and Applying: Panel repairs (also called full panel refinishing) is a refinishing technique in which an entire body panel is painted edge to edge -- from seam to seam -- rather than blending into the panel center, used when the color is too difficult to spot-blend or when the entire panel has been replaced.
PathogensSafety Precautions: Pathogens are microorganisms that can cause illness and disease.
Pattern Control KnobSpray Gun Operation: The pattern control knob adjusts the amount of air flowing through the air cap horns or side air nozzles of a spray gun.
Pearl PaintPaint Mixing, Matching and Applying: Pearl paint is an automotive finish that incorporates translucent reflective particles such as mica to create a lustrous, color-shifting appearance that changes based on the viewing angle.
Permissible Exposure Limit (PEL)Safety Precautions: The maximum concentration of a substance a worker can be exposed to over a set time period (typically an 8-hour shift) without expected harm.
Personal Protection Equipment (PPE)General Trade Terms: The complete set of protective gear -- respirators, eye and face protection, gloves, and protective clothing -- that a collision repair technician wears to prevent injury while servicing vehicles.
Personal Protective EquipmentSafety Precautions: Personal Protective Equipment (PPE) is the category of wearable safety gear - including eye protection, respiratory protection, hearing protection, gloves, and protective clothing - worn by collision repair technicians to protect against the specific chemical, mechanical, thermal, and noise hazards present in the shop.
Piano WireSurface Preparation: Piano wire is a thin, taut length of steel wire used to saw through double-sided adhesive tape between a molding and the panel surface without scratching the paint.
PigmentPaint Mixing, Matching and Applying: Pigments are the fine powder particles in automotive paint that provide color, hiding power (opacity), and durability to the cured film.
Pigment FlotationFinish Defects, Causes and Cures: Pigment flotation is a paint defect where different pigments in a mixed color separate and float unevenly as the paint film builds, causing a visible color change or blotching.
PinholesSolving Paint Application Problems: Pinholes are small holes in the paint or filler surface caused by air trapped in the body filler or paint during mixing or application, not by silicone contamination.
Plastic AlloyPaint Mixing, Matching and Applying: A plastic alloy is a material formed when two or more different polymers are mixed together.
PlasticizerPaint Mixing, Matching and Applying: A plasticizer is a material added to paint to make the film more flexible.
Plotting ColorPaint Mixing, Matching and Applying: Plotting color is a color analysis technique that graphically locates a paint color's position based on its three dimensions -- value (lightness), hue (color family position), and chroma (saturation) -- to guide accurate tinting decisions.
PneumaticSpray Gun Operation: Pneumatic describes a tool that is powered by compressed air.
PolishFinish Defects, Causes and Cures: The final finishing operation that uses progressively finer abrasive compounds applied by a powered rotary or dual-action (DA) polisher - or by hand - to level surface irregularities (overspray, dust nibs, orange peel, sanding scratches) and restore the paint film to a high-gloss, factory-quality appearance; also called buffing.
PolisherFinish Defects, Causes and Cures: A fine abrasive polishing compound (or the tool used to apply it) used to remove light surface defects and restore gloss to a finish after color sanding or minor scratch repair.
Polishing CompoundFinish Defects, Causes and Cures: Polishing compound is a fine-grit abrasive compound applied with a machine polisher to remove minor surface imperfections from cured paint and bring it to a smooth, glossy finish.
Polishing CreamFinish Defects, Causes and Cures: Polishing cream is an extremely fine abrasive paste used for manual removal of the swirl marks left after machine compounding, and for smoothing and polishing a finish.
Polishing MachineFinish Defects, Causes and Cures: A polishing machine is a dual-action (DA) power tool that combines spinning and orbital pad movement to safely produce a high-gloss finish and remove fine scratches and swirl marks without the risk of burning through the paint.
Poor AdhesionFinish Defects, Causes and Cures: Poor adhesion is a paint failure where the primer fails to bind with the substrate, or the paint fails to bind with the undercoat, causing the finish to peel starting from small spots.
Pop Rivet GunVehicle Systems Knowledge: A pop rivet gun is a hand-held tool designed to place and secure rivets into a blind hole.
Post-Painting OperationsPaint Mixing, Matching and Applying: Post-painting operations are the final workflow steps after the topcoat has been applied, including removing masking tape, de-nibbing, polishing, reinstalling parts, and detailing the vehicle before customer delivery.
Pot LifePaint Mixing, Matching and Applying: Pot life is the time a painter has to apply a plastic or paint finish after a catalyst or hardener has been added, before it hardens.
Pounds Per Square Inch (psi)Spray Gun Operation: Pounds per square inch (psi) is a measurement of the air pressure or force delivered by the compressor.
Power SanderSurface Preparation: A power sander is a hand-held power tool used to speed the rate of sanding or polishing surfaces.
Power WasherSurface Preparation: A power washer is a cleaning machine that uses a high-pressure spray of water to dislodge debris.
PPMLegal and Environmental Practices: PPM is an abbreviation for parts per million.
Prep SolventSurface Preparation: Prep solvent (wax and grease remover) is a fast-drying chemical cleaner applied to vehicle surfaces before painting to remove wax, oil, grease, silicone, and other contaminants that would cause paint adhesion failures.
Press FitVehicle Systems Knowledge: A press fit is a joining technique in which one part is forced into another.
Pressure Feed GunSpray Gun Operation: A pressure feed gun is a paint spray gun in which air pressure or a high-pressure pump forces paint from a separate pressurized pot into the gun.
Pressure SwitchSpray Gun Operation: A pressure switch is an electric switch controlled by air pressure, used for starting and stopping electric motors at set pressures.
Pressure-Fed Spray GunsSpray Gun Operation: Pressure-fed spray guns use regulated air pressure applied to the paint cup or remote pressure pot to push material to the gun, eliminating the need for a siphon effect and enabling faster throughput of heavy or high-viscosity materials.
Pressure-Feed Spray GunSpray Gun Operation: A pressure-feed spray gun draws paint from a separate pressurized pot rather than a cup mounted on the gun, typically used for spraying large surfaces such as semi-trucks.
Prime CoatPaint Mixing, Matching and Applying: Prime coat is the category of surface preparation undercoats -- including self-etching primers, primer-surfacers, sealers, and adhesion promoters -- applied to the repair area before the color topcoat to ensure proper adhesion and corrosion protection.
PrimerSurface Preparation: Primer is a thin undercoat applied to bare metal or a prepared surface to promote adhesion of the topcoat and provide a first layer of corrosion protection.
Primer Masking PaperSurface Preparation: Primer masking paper is a less expensive, more porous grade of masking paper used to mask areas during primer application only -- it must not be used during topcoat painting because paint solvents can soak through it and damage the protected surfaces.
Primer-SealerSurface Preparation: Primer-sealer is a primer coat used to improve color hold-out and act as a barrier that prevents bleed-through of the original color into a new topcoat.
Primer-SurfacerSurface Preparation: An undercoat product sprayed over a repaired or existing substrate to build film thickness, fill surface scratches and minor imperfections, and create a level, sandable foundation for the color topcoat.
Proportional Mixing NumbersPaint Mixing, Matching and Applying: Proportional mixing numbers denote the amount of each material needed by volume, with the first number usually referring to the parts of the primary material.

R

Rail DustFinish Defects, Causes and Cures: Rail dust is airborne industrial contamination -- tiny metal particles from rail transport -- that embeds in a paint finish and looks like a sprinkling of dirt specks.
ReactivitySafety Precautions: Reactivity is an EPA hazardous waste characteristic for materials that react violently with water or release deadly gases when exposed to acids.
ReducerPaint Mixing, Matching and Applying: A solvent-based additive mixed into paint products to lower their viscosity - thinning the material to the spray viscosity required for proper atomization, flow, and leveling through the spray gun - available in multiple evaporation speeds (slow, medium, fast) matched to shop temperature, panel size, and application technique.
Reduction RatioPaint Mixing, Matching and Applying: Reduction ratio is the proportion of reducer added to paint, expressed as a percentage (such as 50%, 100%, or 200% reduction) that determines how thin the mixed paint is for spraying.
RefinishPaint Mixing, Matching and Applying: The complete process of restoring a vehicle's color and surface appearance to its pre-loss condition by applying paint products - primer, sealer, basecoat, clearcoat - in the sequence and methods specified by the paint manufacturer, returning the repaired vehicle to a finish that matches the adjacent panels in color, gloss, and texture.
Refinishing GuidesPaint Mixing, Matching and Applying: Refinishing guides are printed or electronic reference publications that provide paint codes, paint type information, application procedures, buffing techniques, and cost-calculation tools for automotive refinishing.
Refinishing MaterialPaint Mixing, Matching and Applying: Refinishing material is the general term for all the products used in the vehicle repainting process, including primers, sealers, basecoats, clear coats, reducers, hardeners, and additives.
Regulatory ObligationsLegal and Environmental Practices: Regulatory obligations are the federal, state, and local legal requirements a collision repair facility must recognize and follow in the course of doing repair work.
Relative DensityPaint Mixing, Matching and Applying: Relative density is the mass of a given volume compared to the same volume of water at the same temperature -- also called specific gravity.
Relief ValveSpray Gun Operation: A relief valve is a safety valve designed to open at a specified pressure.
Repair PrimecoatsSurface Preparation: Repair primecoats are the layers of surface preparation products applied to the repaired area before the topcoat, functioning as an adhesion and corrosion-protection bridge between the bare substrate and the finish paint.
Resource Conservation and Recovery Act (RCRA)Safety Precautions: The federal law that regulates hazardous waste generation and disposal, including reduced requirements for shops that qualify as small-quantity generators.
RespiratorSafety Precautions: A respirator is a mask worn over the mouth and nose to filter particles and fumes out of the air being breathed.
Respirator Fit TestSafety Precautions: A respirator fit test is a pre-use procedure that verifies an air-purifying or half-mask respirator seals correctly against the wearer's face, preventing contaminated air from bypassing the filter cartridges.
Retaining ClipVehicle Systems Knowledge: A retaining clip is a spring-type device used to secure one component to another.
RetarderPaint Mixing, Matching and Applying: A retarder is a slow-evaporating thinner or reducer additive used to slow drying.
Reverse MaskingPaint Mixing, Matching and Applying: Reverse masking is a spot repair blend technique in which the tape is rolled over and into a curved shape to prevent a visible paint parting line along the masking edge.
Right-To-Know LawSafety Precautions: The right-to-know law establishes a person's right to essential information and stipulations for safely working with hazardous materials.
Right-to-Know LawsSafety Precautions: Right-to-Know Laws are federal and state regulations (rooted in OSHA's Hazard Communication Standard) that guarantee workers the legal right to obtain information about hazardous chemicals they work with - including chemical identity, health hazards, exposure limits, and safe handling procedures through required SDS documentation and employee training.
Roloc Grinding DiscsSurface Preparation: Roloc grinding discs are small, round abrasive discs with a quick-change twist-lock mandrel that mount on a right-angle die grinder, used to rapidly strip paint, rust, and old body filler from weld joints, spot-weld locations, repair areas, and hard-to-reach spots before panel repair or welding.
Rub-ThroughFinish Defects, Causes and Cures: Rub-through is a buffing defect where the buffer is held in one spot too long, cutting completely through the clearcoat (and sometimes the color coat) down to bare substrate.
Rubbing CompoundFinish Defects, Causes and Cures: Rubbing compound is the coarsest abrasive polish used in automotive finishing to rapidly remove paint imperfections such as orange peel, heavy sanding scratches, and surface defects, leaving a matte finish that requires further polishing.
Runs And SagsFinish Defects, Causes and Cures: Runs and sags are heavy applications of sprayed material that fail to adhere uniformly to the surface, allowing the film to slide downward.
RustPaint Mixing, Matching and Applying: Rust is corrosion that forms on iron or steel when exposed to air and moisture.
Rust ConvertersSurface Preparation: Rust converters are chemical products applied to corroded metal that convert active ferrous (red) rust into a stable ferric compound, then seal the surface with a latex emulsion, providing an alternative to mechanical rust removal in hard-to-reach areas.

S

SAEPaint Mixing, Matching and Applying: An abbreviation for the Society of Automotive Engineers, an organization that publishes engineering standards used throughout the automotive industry.
Safety Data Sheets (SDS)Safety Precautions: Safety Data Sheets (SDS) are standardized technical documents provided by chemical product manufacturers that describe hazardous ingredients, health risks, PPE requirements, safe handling procedures, and emergency response information for potentially dangerous materials.
Safety GlassesSafety Precautions: Safety glasses are protective eyewear.
Safety ProgramSafety Precautions: A safety program is a shop's written policy setting rules for equipment use and chemical disposal, designed to protect the health and welfare of all employees.
Sand Fix PasteSurface Preparation: Sand fix paste is a compound used with a scuff pad to prepare adjacent panel areas for color blending.
Sand Scratch SwellingFinish Defects, Causes and Cures: Sand scratch swelling refers to enlarged sand scratches caused by the swelling action of topcoat solvents.
Sand ScratchesSurface Preparation: Sand scratches are marks made in metal or an old finish by an abrasive.
SandblastingSurface Preparation: Sandblasting is a method of cleaning metal using an abrasive, such as sand, propelled under air pressure.
SandingSurface Preparation: Sanding is the use of an abrasive-coated paper or plastic backing to level and smooth a body surface being repaired.
Sanding BlockSurface Preparation: A sanding block is a hard, flexible block that provides a smooth backing for hand sanding operations.
Sanding PadSurface Preparation: A sanding pad is a soft mounting surface that backs abrasive material during sanding.
SandpaperSurface Preparation: Sandpaper is a flexible abrasive sheet consisting of a paper, cloth, or film backing coated with abrasive mineral particles, used throughout collision repair for surface leveling, scratch removal, and surface preparation before painting.
ScraperSurface Preparation: A scraper is a hand-held tool used to scrape away paint or other surface material.
Scratch AwlSurface Preparation: A scratch awl is a pointed tool used for marking and piercing sheet metal.
ScrewdriverVehicle Systems Knowledge: A screwdriver is a hand-held tool, sometimes pneumatically or electrically powered, used to tighten or loosen screw-type fasteners.
ScuffSurface Preparation: To scuff is to roughen a surface by rubbing it lightly with sandpaper to provide a suitable surface for painting.
Scuff PadsSurface Preparation: Scuff pads are synthetic abrasive sponge-like pads used to manually scuff and dull painted or primed surfaces in preparation for painting, especially on panel edges, contours, and areas that power sanders cannot reach.
SealerPaint Mixing, Matching and Applying: Sealer is an intercoat applied between the primer (or existing old finish) and the topcoat, improving adhesion and creating a uniform base for color to be applied over.
Self-Contained RespiratorSafety Precautions: A self-contained respirator is a respirator equipped with a compressed air cylinder that provides the wearer's breathing air.
Self-Contained Spray Gun CleanerSpray Gun Operation: A self-contained spray gun cleaner is an enclosed cleaning unit used to thoroughly clean a spray gun after each use without open solvent exposure.
Self-Etching PrimerSurface Preparation: Self-etching primer is an acidic primer that chemically etches bare metal surfaces as it cures, creating a mechanical and chemical bond that dramatically improves primer adhesion and corrosion resistance.
Self-Piercing Rivet (SPR)Vehicle Systems Knowledge: A rivet that pierces and joins metal panels without a pre-drilled hole, leaving a backside hole that must be filled with structural adhesive to prevent corrosion.
SemiglossPaint Mixing, Matching and Applying: Semigloss is a gloss level between high gloss and low gloss.
Setting TimePaint Mixing, Matching and Applying: Setting time is the time it takes for solvents to evaporate or resins to cure and become firm.
SettlingPaint Mixing, Matching and Applying: Settling is the separation, caused by gravity, of one or more components from a paint, resulting in a layer of material at the bottom of the container.
ShadingPaint Mixing, Matching and Applying: Shading is a custom painting technique accomplished by holding a mask or card in place and overspraying the surrounding area.
Shelf LifePaint Mixing, Matching and Applying: Shelf life is the length of time a manufacturer recommends a material may be stored and still remain suitable for use.
Shipping CoatingSurface Preparation: Shipping coating is a temporary protective coating applied by aftermarket panel manufacturers to new metal parts during storage and shipping to prevent corrosion, which must be completely removed before priming and painting because it is not paintable.
Shop LayoutSafety Precautions: Shop layout is the arrangement of work areas, storage, aisles, office, and other spaces in a shop.
Show-ThroughSurface Preparation: Show-through is sand scratches in an undercoat that remain visible through the topcoat.
Side TonePaint Mixing, Matching and Applying: Side tone (also called color pitch) is how a metallic finish appears when viewed at a 45-degree angle or less.
Silicon CarbideSurface Preparation: Silicon carbide is an abrasive grit used in sanding and grinding.
Simulated Seam TapePaint Mixing, Matching and Applying: Simulated seam tape is tape used to give the appearance of seams in a spray-on vinyl roof covering.
Single CoatSpray Gun Operation: A single coat is a coat of material produced by two passes of the spray gun, with one pass overlapping the other in half steps.
Single-Stage CompressorSpray Gun Operation: A single-stage compressor is an air compressor in which atmospheric air is drawn in and compressed to delivery pressure in a single piston stroke, suitable for intermittent service applications up to approximately 125 psi.
Siphon Feed GunSpray Gun Operation: A siphon feed gun is a type of paint spray gun in which paint is drawn out of the container by vacuum action.
Siphon-Feed Spray GunSpray Gun Operation: A siphon-feed spray gun uses airflow through the gun head to create a siphoning action that draws paint upward from a lower-mounted cup into the airstream.
SkinningPaint Mixing, Matching and Applying: Skinning is the formation of a thin, tough film on the surface of a liquid paint.
Slip SolutionSurface Preparation: Slip solution is a special soap-and-water solution used to soak a decal transfer before applying it to a vehicle surface, allowing it to be positioned and slid into place.
Snap FitVehicle Systems Knowledge: A snap fit is a joining technique in which parts are forced over a lip or into an undercut retaining ring.
Society Of Collision Repair Specialists (SCRS)Legal and Environmental Practices: SCRS is a collision repair industry trade association, named in the source material alongside other national organizations that serve the collision repair industry.
Solid Color PaintsPaint Mixing, Matching and Applying: Solid color paints are paints that do not contain reflective flakes or mica particles.
SolidsPaint Mixing, Matching and Applying: Solids is the percentage of solid material remaining in a paint after the solvents have evaporated.
SolvencyPaint Mixing, Matching and Applying: Solvency is the ability of a liquid to dissolve resin or other material.
SolventPaint Mixing, Matching and Applying: A solvent is used to thin lacquers and enamels.
Solvent PoppingFinish Defects, Causes and Cures: Solvent popping is blisters that form on a paint film, caused by solvent trapped beneath the surface.
Sound-Deadening MaterialPaint Mixing, Matching and Applying: Sound-deadening material is a heavy, flexible damping compound applied to interior body panels -- especially the floor pan, firewall, and door inners -- to absorb and reduce vibration, road noise, and drivetrain noise from entering the passenger compartment.
Spanner SocketVehicle Systems Knowledge: A spanner socket is a specialty tool used for special applications, such as removing antennas, mirrors, and radio trim nuts.
Specific GravityPaint Mixing, Matching and Applying: Specific gravity is the ratio of the weight of a specific volume of a substance to the weight of an equal volume of a reference substance.
SpectrophotometerPaint Mixing, Matching and Applying: A spectrophotometer is an instrument used to measure color, comparing the reflectance of a test sample to the reflectance of a standard across the visible spectrum.
Spider WebbingPaint Mixing, Matching and Applying: Spider webbing is a custom painting effect produced by forcing acrylic lacquer from the spray gun in the form of fibrous threads.
SpittingSpray Gun Operation: Spitting is a spray gun problem caused by dried-out packing around the fluid needle valve.
Spitting Spray GunSpray Gun Operation: A spitting spray gun is a gun that fails to atomize all of the liquid material properly.
Spontaneous CombustionSafety Precautions: Spontaneous combustion is a process in which material ignites by itself, without an external ignition source.
Spot PuttySurface Preparation: Spot putty is a plastic-like material used for filling small holes or sand scratches -- also called glazing putty.
Spot RepairsPaint Mixing, Matching and Applying: Spot repairs are small-area refinishing operations used when only a limited section of a panel is damaged, allowing the original paint to remain on most of the panel while only the damaged area is repainted and blended into the surrounding finish.
Spray BoothSpray Gun Operation: A spray booth is an enclosed, ventilated, fire-safe painting environment that provides clean, filtered air flow across the vehicle, removes paint vapors and overspray, and creates the controlled conditions required to produce a professional paint finish.
Spray GunSpray Gun Operation: A precision pneumatic tool that atomizes liquid coating materials into a fine mist and propels them onto a vehicle surface; the central instrument in any automotive refinishing system.
Spray Gun Cleaning TankSpray Gun Operation: A spray gun cleaning tank is a pressurized, enclosed container used to flush and clean spray guns and related painting equipment with solvent, capturing waste solvent and reducing VOC emissions and fire hazard compared to open-pan cleaning.
Spray Gun DirectionSpray Gun Operation: Keeping the spray gun aimed and angled correctly relative to the panel so the paint film deposits evenly across the surface, rather than unevenly from an angled or wandering gun path.
Spray Gun DistanceSpray Gun Operation: Spray gun distance is the measured gap maintained between the spray gun nozzle and the target surface during painting, typically 6-10 inches (203-254 mm), which directly affects atomization quality, film build, and finish texture.
Spray Gun OilSpray Gun Operation: Spray gun oil is a specially formulated lubricant for spray gun moving parts - needle, trigger pivot, and air valve - that is chemically compatible with automotive paint systems and will not cause fisheye or adhesion defects if trace amounts contact the painted surface.
Spray Gun SpeedSpray Gun Operation: How fast the spray gun is moved sideways across the panel while spraying, a technique variable that directly affects how much material is deposited on the surface.
Spray Gun StrokeSpray Gun Operation: Spray gun stroke is the controlled, even side-to-side hand motion used to move the spray gun across the surface being painted, requiring a consistent speed, distance, and parallel path to produce a uniform film thickness.
Spray Gun TriggeringSpray Gun Operation: Spray gun triggering involves keeping constant air flow out of the nozzle and triggering paint flow only when depositing paint material.
Spray MaskPaint Mixing, Matching and Applying: A spray mask is a thin film sprayed onto a surface to be decorated, into which a design is cut so the desired portions can be removed before painting.
Spray OverlapSpray Gun Operation: Spray overlap is the technique of positioning each successive spray pass so that it covers approximately 50 percent of the previous pass, ensuring uniform paint film thickness and preventing light or missed areas between passes.
Spray PatternSpray Gun Operation: Spray pattern is the cross section of the spray leaving the gun.
Spray Pattern OverlapPaint Mixing, Matching and Applying: Spray pattern overlap is how much of the previous spray pass each new pass covers, typically 50 percent for single-stage or clearcoat and 75 percent for basecoat.
Spray Pattern TestSpray Gun Operation: A spray pattern test is a diagnostic procedure performed before painting in which the spray gun is triggered onto a sheet of paper or cardboard to evaluate atomization quality, paint flow rate, pattern shape, and distribution uniformity.
Spray SchedulePaint Mixing, Matching and Applying: A spray schedule is a written record the painter maintains during a refinishing job that documents the exact time each coat of primer, sealer, or topcoat material was applied, enabling precise control of flash times between coats.
Spray-On Roof CoveringPaint Mixing, Matching and Applying: A spray-on roof covering is a vinyl coating sprayed in place to produce a vinyl-roof appearance.
Spray-Out Test PanelPaint Mixing, Matching and Applying: A spray-out test panel is used to check the paint match of solid and metallic colors -- but not three-stage or pearl paints.
Spreader AdjustmentSpray Gun Operation: The spreader adjustment (fan pattern knob) is the spray gun control that widens or narrows the fan pattern to match the size of the area being painted.
Stabilizer-ReducerSpray Gun Operation: Stabilizer-reducer is a reducer product containing a special basecoat resin designed to allow a faster recoat time and better metal flake control.
Standard Color ChipPaint Mixing, Matching and Applying: A standard color chip is the intended color used when the vehicle was painted at the factory, printed on a patch of coated paper.
Static ChargeSafety Precautions: An accumulation of electrical charge on the vehicle body surface - generated by friction between the vehicle and airflow, by paint spray operations, and by shop activity - that must be dissipated (grounded) before and during spray painting to prevent paint contamination, fish-eye defects, and fire or explosion hazard when spraying flammable solvent-borne coatings.
StencilPaint Mixing, Matching and Applying: A stencil is an impervious material into which designs have been cut.
Stone-Chip Resistant CoatingSurface Preparation: Stone-chip resistant coating is a textured protective coating sprayed on before the topcoat to help resist rock and debris impact damage.
StoolsSafety Precautions: A stool is a low seat equipped with wheels.
StrainerPaint Mixing, Matching and Applying: A strainer is a fine mesh screen used to remove small lumps of dirt or other debris from a liquid.
StreakingSolving Paint Application Problems: Streaking is a metallic or mica paint defect that shows as alternating light and dark streaks, most visible in light colors like silver or gold, caused by uneven metallic flake orientation.
StripSurface Preparation: Complete removal of the existing paint system from a vehicle panel or area down to bare substrate - performed when the existing paint film is too heavily damaged, contaminated, or thermally compromised to allow refinishing over it, or when diagnosing hidden rust or prior body work under the paint.
Striping BrushPaint Mixing, Matching and Applying: A striping brush is a small brush used to apply stripes and other designs by hand.
StudVehicle Systems Knowledge: A stud is a headless bolt having threads on one or both ends.
SubstrateSurface Preparation: The base material on which a coating system is applied - steel, aluminum, galvanized metal, SMC, or flexible plastic - each requiring its own specific primer system and surface preparation sequence for proper paint adhesion.
Suction FeedSpray Gun Operation: A spray gun configuration in which the paint cup is mounted below the gun body and material is drawn upward into the fluid nozzle by the vacuum (siphon effect) created by high-velocity air passing over the suction tube - the predecessor to modern gravity-feed guns; still used in some applications requiring large-capacity cups for high-volume application.
Suction Spray GunsSpray Gun Operation: Suction (siphon) spray guns are a type of spray gun in which high-velocity airflow through the gun head creates a low-pressure (suction) zone that draws paint upward from a cup attached below the gun body into the airstream for atomization.
SunlightPaint Mixing, Matching and Applying: Sunlight, as a paint color evaluation standard, refers to natural outdoor daylight that contains the full visible light spectrum, used as the benchmark for evaluating color match accuracy because it renders all color wavelengths equally.
Supplied Air RespiratorSafety Precautions: A supplied air respirator is a respirator system that pumps clean, uncontaminated air from an external source into the mask, required for painters working with catalyzed paint containing isocyanates.
Surface PreparationSurface Preparation: Surface preparation is the complete sequence of cleaning, sanding, priming, spot-puttying, and recleaning operations performed on a vehicle body to create an ideal substrate for the topcoat paint system.
Surface ScratchingFinish Defects, Causes and Cures: Surface scratching is the use of an extra-fine abrasive to lightly texture a finish, such as when preparing a surface for blending or removing very light imperfections.
Surface ScuffingSurface Preparation: Surface scuffing uses an ultrafine abrasive to cut microscopic scratches into a body surface to be painted.
Surface ThermometerPaint Mixing, Matching and Applying: Used to measure a vehicle's body temperature when painting.
SurfacerPaint Mixing, Matching and Applying: Surfacer is a heavily pigmented paint applied to a substrate to smooth the surface before subsequent coats of paint.
Swirl MarksFinish Defects, Causes and Cures: Swirl marks are round or curved lines in the paint caused by buffing, preventable by keeping the polishing pad clean and free of compound buildup.
Swirl RemoverFinish Defects, Causes and Cures: Swirl remover is another term for polishing cream -- a fine polishing material used to remove the fine circular scratches left by machine buffing.

T

TackPaint Mixing, Matching and Applying: Tack is the stickiness of a paint film or an adhesive.
Tack ClothSurface Preparation: A tack cloth is a cheesecloth impregnated with a non-drying varnish-based adhesive that is used to wipe the prepared body surface immediately before spraying to remove fine dust, lint, and sanding particles that compressed air alone cannot remove.
Tack CoatPaint Mixing, Matching and Applying: The initial, very light application of paint sprayed at the beginning of the coating sequence - applied before the full wet coats - to create a tacky foundation layer that anchors subsequent coats, preventing them from sliding, sagging, or producing orange peel on vertical surfaces before they can flow and level.
Tack RagSurface Preparation: A loosely woven cheesecloth or non-woven fabric treated with a slightly tacky, non-transferring resin solution - used as the final surface preparation step immediately before applying paint to remove any remaining dust, lint, or fine particles from the panel surface without leaving residue that would contaminate the fresh paint film.
TapVehicle Systems Knowledge: A tap is a device used to cut internal threads, and to clean and rethread existing holes.
Tap And Die SetVehicle Systems Knowledge: A tap and die set is a set of tools used to restore damaged threads or to cut new threads -- taps for internal threads, dies for external ones.
Tape TrackingSolving Paint Application Problems: Tape tracking is a paint defect appearing as visible lines or edges in the finish, caused by improperly applied masking tape or spraying over a still-tacky first color during two-toning.
Technical Data Sheet (TDS)Paint Mixing, Matching and Applying: The manufacturer document that states a paint product's mixing ratios, compatible products, reduction, and application conditions, essential to check before applying it.
Technical PenPaint Mixing, Matching and Applying: A technical pen is a pen used to draw pinstripes by hand on a vehicle.
Temperature Make-Up SystemSpray Gun Operation: A temperature make-up system is a heating and cooling system that filters and conditions air before it enters a paint spray booth.
Tempered GlassPaint Mixing, Matching and Applying: Tempered glass is glass that has been heat-treated to increase its resistance to impact compared to regular glass of the same thickness.
Tensile StrengthVehicle Systems Knowledge: Tensile strength is the maximum force per unit of area a material can withstand before it fractures or breaks -- its resistance to being pulled apart.
Test LightPaint Mixing, Matching and Applying: A test light (test lamp) is a simple electrical diagnostic tool consisting of a light bulb with a pointed probe and a grounded lead, used to detect the presence of voltage at a circuit point by illuminating when connected between a live wire and ground.
Test PatternSpray Gun Operation: A test pattern is a trial spray sprayed onto masking paper before painting the vehicle, used to check a spray gun's fluid flow, pattern shape, and atomization.
Texture MatchSurface Preparation: Texture match is the process of identifying and replicating a surface's original texture pattern -- such as a chip-resistant coating's texture -- so a repair blends invisibly with the surrounding factory finish.
Textured CoatingPaint Mixing, Matching and Applying: A thick, pebble-textured protective coating (chip guard or stone guard) applied to the lower body panels, rocker panels, wheel houses, and lower door areas to provide impact resistance against stones, road debris, and gravel - restoring the OEM-applied texture that protects the substrate from chip-induced corrosion in high-abrasion zones.
Texturing AgentPaint Mixing, Matching and Applying: A texturing agent is material added to paint to produce a bumpy texture.
Thin-Bodied SealersSurface Preparation: Thin-bodied sealers are designed to fill seams under 1/8 inch (3.2 mm) wide.
ThinnerPaint Mixing, Matching and Applying: A thinner is a solvent used to thin lacquers and acrylics, and a low-cost solvent used to clean spray guns and other equipment.
Three-StagePaint Mixing, Matching and Applying: Three-stage is a paint system of three layers producing a pearlescent appearance -- a basecoat, a midcoat, and a clearcoat.
Threshold Limit Value (TLV)Safety Precautions: An exposure guideline, similar to a PEL, representing the maximum airborne concentration of a substance a worker can be exposed to without expected harm.
TintPaint Mixing, Matching and Applying: The iterative color matching process in which the refinisher adjusts a paint formula by adding small amounts of individual toner components - test-spraying on a spray-out card, evaluating the result against the vehicle, and making further toner additions until the mixed paint matches the vehicle's existing finish at all viewing angles.
Tint TonePaint Mixing, Matching and Applying: Tint tone is the shade that results when a color is mixed with white paint.
Tintable PrimerPaint Mixing, Matching and Applying: A primer-surfacer formulated to accept a small percentage of topcoat color mixed into it before application - producing a tinted undercoat whose color is close to the topcoat color, which dramatically reduces the number of topcoat coats required to achieve full hiding and color match on a new or repaired panel.
TintingPaint Mixing, Matching and Applying: Tinting is the process of adjusting a mixed paint color by adding very small amounts of concentrated color pigments to correct specific color properties -- such as hue, value, or chroma -- that remain slightly off after the standard formula is mixed.
TopcoatsPaint Mixing, Matching and Applying: Topcoats are the final, visible paint layers applied over the primer system that provide the vehicle's color, gloss, and UV and environmental protection, including single-stage, basecoat/clearcoat, and tri-coat systems.
Torque PatternVehicle Systems Knowledge: A prescribed crisscross or alternating tightening sequence for multiple fasteners that ensures a part is clamped evenly and prevents warpage from uneven loading.
Torque SpecificationsVehicle Systems Knowledge: Manufacturer-specified tightening values for individual fasteners that ensure correct clamp load without over-stressing the bolt or the assembled component.
Torque-to-Yield (TTY)Vehicle Systems Knowledge: A fastener design, often called a stretch bolt, that is intentionally tightened past its elastic limit during installation and must never be reused once removed.
Torx FastenerVehicle Systems Knowledge: A Torx fastener (also called a star fastener) is a six-point fastener that grips and drives without slippage, commonly used on late-model vehicles for luggage racks, headlights, taillight assemblies, mirror mountings, door strikers, seat belts, and exterior trim.
Total Product SystemSurface Preparation: A total product system is a manufacturer's complete, matched set of primers, sealers, and topcoats designed to be used together for guaranteed compatibility and warranty coverage.
Touch-Up GunSpray Gun Operation: A touch-up gun is a paint spray gun similar to a conventional gun but with smaller capacity, used for touch-up, stenciling, and small repairs.
ToxicSafety Precautions: An EPA hazardous waste classification describing a material that leaches heavy metals at concentrations exceeding 100 times drinking water standards, requiring lawful disposal as hazardous waste.
Toxic FumesSafety Precautions: Toxic fumes are harmful fumes that can cause illness or death.
Toxicity Characteristic Leaching Procedure (TCLP)Safety Precautions: An EPA test that determines whether a waste material will leach toxic chemicals into groundwater, which can reclassify borderline waste from hazardous to non-hazardous and reduce disposal costs.
TPOPaint Mixing, Matching and Applying: TPO (thermoplastic olefin) is a specific plastic type identified by its ISO code, commonly used for automotive bumper covers and requiring plastic-specific refinishing procedures.
Tri-CoatSurface Preparation: Tri-coat (multi-stage) paint is a three-layer paint system consisting of a basecoat, an intermediate pearl or mica coat, and a clearcoat.
Tri-Stage Pearl CoatsPaint Mixing, Matching and Applying: Tri-stage pearl coats (tri-coats) are a three-layer topcoat system in which a solid or metallic basecoat is sprayed first, a translucent pearl or interference midcoat is applied over it, and then multiple clearcoat layers are applied over the top to produce a complex, depth-rich color effect.
TurpentinePaint Mixing, Matching and Applying: Turpentine is a solvent derived from the distillate of pine trees.
Two-Component Epoxy PrimerSurface Preparation: A two-component epoxy primer is a primer material having two components that react chemically after being mixed together.
Two-Component PuttySurface Preparation: Two-component putty (two-part putty) is a putty-and-hardener system used to fill minor surface imperfections such as scratches or pinholes in body filler before final priming.
Two-PartPaint Mixing, Matching and Applying: Two-part describes a product supplied in two components that must be mixed together in correct proportions immediately before use.
Two-Part PuttySurface Preparation: Two-part putty is a two-component, catalyst-cured glazing compound consisting of a base material and a separate cream hardener that cures rapidly, used to fill small surface imperfections, pinholes, and sand scratches in primer before the final topcoat.
Two-Stage CompressorSpray Gun Operation: A two-stage compressor is an air compressor that compresses intake air twice -- first to an intermediate pressure in a larger cylinder, then cools the air in an intercooler, and compresses it a second time to delivery pressure in a smaller cylinder -- producing cooler, drier, and more efficient compressed air at pressures above 125 psi.
Two-Stage PaintsPaint Mixing, Matching and Applying: Two-stage paint is a topcoat system in which the color (stage one -- basecoat) and the gloss/protection (stage two -- clearcoat) are applied as separate layers, allowing the basecoat to be formulated purely for color accuracy while the clearcoat provides durability and gloss.
Two-TonePaint Mixing, Matching and Applying: Two-tone is a paint scheme using two different colors on a single vehicle.
Two-ToningSolving Paint Application Problems: Two-toning is a refinish procedure that applies two different paint colors to one panel, requiring the first color to fully dry before masking and spraying the second.

U

Ultraviolet (UV) LightPaint Mixing, Matching and Applying: Ultraviolet light is the part of the invisible light spectrum responsible for the degradation of paints.
Underwriters Laboratories (UL)Safety Precautions: Underwriters Laboratories, abbreviated UL, is the approval mark called for on safety-critical shop equipment such as the drum transfer pump used to move flammable liquids out of a drum.
United States Customary System (USCS)Vehicle Systems Knowledge: The United States Customary System, or USCS, is the fractional measuring system in which fastener head size and wrench size are both expressed as fractions rather than as metric numbers.
Universal ThinnerPaint Mixing, Matching and Applying: Universal thinner is a solvent used both to thin lacquers and to reduce enamels.
UrethanePaint Mixing, Matching and Applying: A versatile polyurethane chemistry used in two distinct collision repair contexts: as a two-component (2K) catalyzed paint system - producing an extremely durable, chemically resistant film when the urethane resin reacts with an isocyanate hardener - available as clearcoat, color coat, primer, and sealer products; and as a high-strength, flexible polyurethane adhesive used to bond stationary glass to the vehicle body opening.
UV PrimerSurface Preparation: UV primer is an ultraviolet light-curing primer applied to bare metal spot repair areas that cures fully in 2-3 minutes under a UV lamp - dramatically reducing cycle time compared to conventional primers - used under body filler or spot putty on small repair areas before finish primer and topcoat.

V

VacuumSpray Gun Operation: Vacuum is any pressure below atmospheric pressure.
ValuePaint Mixing, Matching and Applying: Value is the lightness or darkness of a color, and also the fair cost or price of an item.
Variance ChipsPaint Mixing, Matching and Applying: Variance chips (alternate color chips) are supplementary paint color chips used to find a closer color match when the standard paint chip doesn't match the vehicle's actual finish.
VehiclePaint Mixing, Matching and Applying: (1) A car or truck. (2) In a paint formulation, everything in the paint except the pigment -- the solvents, resins, gums, and dryers that carry and bind the pigment to the surface.
Vehicle Lift PointsSafety Precautions: Vehicle lift points are the specific structural locations on the frame, subframe, or unibody pinch welds designated by the vehicle manufacturer as the only safe locations for positioning jack stands, floor jacks, or vehicle lift pads when raising a vehicle.
Ventilation FanSafety Precautions: A ventilation fan is an electrical device used to remove vapors and fine particles from the work area.
Vinyl PaintPaint Mixing, Matching and Applying: Vinyl paint is any paint material applied to a vinyl top to restore its color.
ViscositySpray Gun Operation: A measurement of how thick or thin a paint material is, indicating how easily it flows. Correct viscosity - achieved through the proper reducer ratio and temperature - is critical for proper atomization and a smooth finish.
Viscosity CupSpray Gun Operation: A viscosity cup (viscometer) is a calibrated metal cup with a small orifice at the bottom used to measure the flow rate (viscosity) of paint or other liquid materials, ensuring they are thinned to the correct consistency for optimal atomization from the spray gun.
VOCLegal and Environmental Practices: VOC is an abbreviation for volatile organic compound -- a material that vaporizes easily.
Volatile Organic Compounds (VOCs)Safety Precautions: Carbon-containing chemical compounds found in solvent-based paints that evaporate into the air during application and curing. Their health and environmental impact has driven the development of low-VOC, waterborne, and high-solids paint formulations in the automotive refinish industry.
VolatilityPaint Mixing, Matching and Applying: Volatility is the tendency of a liquid to evaporate -- a volatile material vaporizes easily.

W

Wash-UpSurface Preparation: Wash-up is cleaning the entire vehicle with soap and water.
Water SpottingFinish Defects, Causes and Cures: Water spotting is a condition created when water evaporates on a finish before the finish is thoroughly dry.
Water-Based PaintPaint Mixing, Matching and Applying: Water-based paint is a refinishing material in which water replaces the petroleum-based organic solvents traditionally used as the paint carrier, dramatically reducing volatile organic compound (VOC) emissions while maintaining color accuracy in a pigmented basecoat that is protected by a conventional clearcoat.
WaxFinish Defects, Causes and Cures: Wax is a slippery solid sometimes added to paints to impart a property, and a prepared material used to shine or improve the appearance of a finish.
Wax and Grease RemoverSurface Preparation: Wax and grease remover is a cleaning solvent used to remove surface contaminants like wax, grease, and oil from a vehicle before body work or refinishing.
Weld Bead DimensionsPaint Mixing, Matching and Applying: Weld bead dimensions refer to the width and height of a weld bead.
Welding BlanketSafety Precautions: A fire-resistant covering placed over vehicle interior components during welding and cutting operations to protect them from heat, sparks, and molten metal splatter.
Welding Filter LensSafety Precautions: A shaded glass or polycarbonate insert in a welding helmet that blocks ultraviolet and infrared radiation from the arc, graded by shade number from 4 (lightest) to 12 (darkest).
Welding HelmetSafety Precautions: A full-head protective device with a shaded filter lens that shields the face, neck, and eyes from heat, molten metal spatter, and harmful radiation produced during all electric welding operations.
Welding RespiratorSafety Precautions: A respiratory protective device with specialized metal fume filter cartridges that remove toxic welding fumes from inhaled air, especially critical when welding zinc-coated steel.
Wet Edge SprayingPaint Mixing, Matching and Applying: A paint application technique where the wet border of a recently applied coat is overlapped first on the next pass, preventing partial curing of the previous coat before the adjacent area is sprayed.
Wet SandpaperSurface Preparation: Waterproof abrasive paper used with water as a lubricant to level paint film imperfections, runs, and dirt nibs before buffing or compounding restores the gloss.
Wet SpotFinish Defects, Causes and Cures: A wet spot is a discoloration where paint fails to dry and adhere uniformly.
Wet-On-WetPaint Mixing, Matching and Applying: Wet-on-wet is the technique of applying a fresh coat of paint over an earlier coat that has been allowed to flash but not cure.
Wheel BurnsFinish Defects, Causes and Cures: Wheel burns are buffing-related paint imperfections caused by excessive heat or pressure from a buffing wheel concentrated in one spot, similar to a localized burn-through.
Wheel MasksPaint Mixing, Matching and Applying: Wheel masks are plastic or cloth covers that fit over wheels and tires.
Wood Grain TransferPaint Mixing, Matching and Applying: A wood grain transfer is a plastic transfer sheet used to simulate wood on the sides of a vehicle.
Workplace Hazardous Materials Information System (WHMIS)Safety Precautions: Canada's workplace hazard communication system, which (like its U.S. OSHA counterpart) requires mandatory hazard warnings on supplier product labels.
WrinkleFinish Defects, Causes and Cures: A wrinkle is a surface distortion -- severe puckering of the paint film -- occurring in a thick coat of enamel before the underlayer has properly dried.

Z

Zahn CupPaint Mixing, Matching and Applying: A Zahn cup is a paint cup with a calibrated hole in the bottom, used to measure a material's viscosity.
Zebra EffectFinish Defects, Causes and Cures: Zebra effect is a streaky-looking metallic finish, usually caused by uneven application.
ZincSurface Preparation: Zinc is a metal coating used to prevent corrosion.
Zinc ChromateSurface Preparation: Zinc chromate is a paint material used as a primer to protect steel and aluminum against rust and corrosion.
Zone ConceptPaint Mixing, Matching and Applying: A paint refinishing strategy that divides vehicle horizontal surfaces into zones separated by character lines and moldings, requiring complete zone-wide application of all coat stages for tri-stage color matching.
Zoning OrdinanceLegal and Environmental Practices: A zoning ordinance is the law that limits the type of businesses allowed in a particular area or zone.

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