Your FREE ASE B2 Flashcards 2026 – 200+ Cards

The cleaning, stripping, sanding, treating, and priming of a substrate so the coatings that follow will adhere and lie flat. Most refinish defects trace back to prep.

The surface being refinished — steel, aluminum, fiberglass, or plastic. Each needs its own cleaning, sanding, and primer choice for adhesion.

A solvent cleaner that lifts wax, oil, silicone, and road film before sanding, applied and wiped with the two-cloth method so contaminants are carried away.

Apply wax and grease remover with one clean cloth and wipe it dry with a second before it evaporates, so dissolved contaminants are removed, not re-deposited.

Decontaminate the panel before sanding so abrasives don't drive in contaminants, and again after, because fresh sanding exposes new surface that must be re-cleaned.

Sanding broken paint edges around a repair into a smooth, gradual taper so the layered edge of the old finish won't telegraph through the new coats. Usually finished ~180-grit.

A contrasting dusting of powder or light spray over primer surfacer; as a block cuts the highs, remaining guide coat marks the lows. Sanded off before color.

Sanding with a long, rigid block in cross-hatched strokes so it bridges high spot to high spot and levels the surface instead of following the lows.

A primer with acid (usually phosphoric) that micro-etches bare metal for adhesion and some corrosion protection. Applied thin; it is not a high-build filler.

A non-porous, moisture-resistant primer that bonds well to clean bare metal and is an excellent corrosion barrier; often the first coat on bare steel.

A high-build undercoat that fills sand scratches and minor imperfections and is block-sanded flat for a level base. It is not a corrosion primer.

An undercoat that promotes adhesion and gives uniform color holdout, keeping the primer from showing through or shifting the final color. Sprayed before color.

A product applied to slick, hard plastics (like TPO bumpers) so refinish coatings will bond to them.

A slightly sticky cloth wiped over a sanded surface to remove dust and debris just before painting, leaving a clean, contaminant-free surface.

Removing old finish with media blasting or a controlled DA sander to minimize heat distortion — never a torch, which warps sheet metal.

Sealing bare metal promptly (etch or epoxy primer) to block moisture and oxygen, preventing rust and the adhesion failures it causes.

Connecting the vehicle to ground to bleed off static electricity, which would otherwise attract dust and could ignite paint vapors.

A common featheredging grit — fine enough that primer surfacer fills the taper without it telegraphing, coarse enough to work efficiently.

A grit often used to profile new, unprimed plastic before an adhesion promoter, creating bite without being too coarse.

A fine grit (or fine non-woven pad) used to scuff existing clearcoat for adhesion before basecoat, breaking the gloss with a uniform scratch pattern.

A magnet sticks to ferrous steel but not to non-ferrous aluminum — the quick way to identify the metal and pick the right primer.

The molded symbol on the back of a bumper cover that identifies the plastic, telling you whether an adhesion promoter and flex additive are needed.

Lightly abrading a glossy cured finish (≈500–600-grit) to break the gloss and create a uniform scratch pattern so new coatings can grip.

Folding masking tape so its lifted edge faces the spray, creating a soft, tapered paint edge that blends instead of leaving a hard ridge.

Covering adjacent panels, glass, and trim with paper and tape to protect them from overspray during spraying.

Residue from tire dressings and some polishes that lowers surface tension and causes fisheyes; removed with a dedicated silicone/wax-and-grease remover.

A synthetic scuff pad used to create a uniform scratch pattern on a painted surface before repainting, especially on contours.

A specialized cleaner that removes the oxide layer and contaminants from aluminum so primer will adhere and not fail.

Tiny holes in primer surfacer; corrected by sanding the area smooth and reapplying primer for an even, pinhole-free base.

The fix for stone chips and minor imperfections — sand the spot and apply primer surfacer for a smooth, consistent base under color.

Applying a sealer/primer to bare metal to form a barrier against rust and corrosion before topcoats.

A polyester filler used to repair dents and low spots; sanded and featheredged, then primed before color.

Specks in the finish from dust settling on wet paint; avoided by a dust-free, clean prep and spray environment.

Sanding fiberglass (≈180-grit) for mechanical adhesion before priming, taking care not to expose or fray the glass mat.

Cleaning a repair area with a degreaser/wax-and-grease remover as the first step to remove contaminants before any sanding or priming.

Grounding the vehicle and equipment to prevent static that attracts dust and can ignite vapors during spraying.

Sanding edges and corners to create a mechanical bond, ensuring paint adheres in these critical, easily missed areas.

Surface irregularities revealed by a guide coat during block sanding; sanded level for a smooth substrate before color.

A grit suited to sanding metal before primer, giving enough profile for paint adhesion.

Bonding created by a scratch profile that gives the coating something to grip; produced by correct-grit sanding.

Clean → strip/sand → clean again → treat/prime — cleaning bookends the prep so contaminants are never trapped under coatings.

Warping of sheet metal from excessive localized heat; avoided by media blasting or a controlled DA sander instead of a grinder or torch.

A visible ring around a repair from a poorly featheredged edge telegraphing through the topcoat; prevented by a smooth taper.

The micro-texture left by sanding that lets a coating mechanically grip; too smooth means poor adhesion, too coarse means scratches telegraph.

Allowing primer surfacer to flash and cure before block-sanding so it sands cleanly without gumming the paper.

Sanding with water (and often a fine grit) to reduce dust, clear the swarf, and leave a finer scratch — used to refine primer or color-sand a finish.

A random-orbit sander that cuts without leaving deep directional scratches; used for featheredging, scuffing, and controlled stripping.

A light prep where a sound existing finish is only scuff-sanded and cleaned before recoating, with no full strip to bare metal.

Stepping up through finer grits (e.g., 320 to 500–600) before color so coarse scratches don't telegraph through the finish.

High Volume, Low Pressure — atomizes paint with a large air volume at low cap pressure for high transfer efficiency, reducing overspray, waste, and emissions.

The percentage of sprayed paint that actually lands on the panel rather than becoming overspray. HVLP guns are designed for high transfer efficiency.

The spray-gun part that meters how much paint is released; the size is matched to the material (larger for primer, smaller for base and clear).

The needle that opens the fluid tip when the trigger is pulled, controlling paint flow with the fluid control knob.

The front of the gun where air streams shape and atomize the fan; a clogged or damaged cap distorts the spray pattern.

The gun adjustment that sets the spray shape from round to a tall oval fan to suit the job.

The gun adjustment that limits how far the needle opens, setting how much paint is released.

A spray gun with the cup on top; gravity feeds paint to the tip. Typically held 6–8 inches from the panel.

A gun with the cup below; the air cap creates a vacuum that draws (siphons) paint up into the air stream.

A gun fed by a pressurized cup or pot, useful for high-volume or high-viscosity materials.

A gun that atomizes by forcing material through a tip at high pressure (no atomizing air); used for heavy-duty industrial coatings, not fine automotive finishes.

The recommended gun-to-panel distance for most refinish guns — too close runs, too far gives dry, rough spray.

Overlapping each spray pass by half the fan width for an even film thickness with no light or heavy bands.

Swinging the gun in an arc with the wrist so distance changes across the stroke; causes uneven film and striping. Move the whole arm, keeping the gun parallel.

Starting and stopping the trigger at the beginning and end of each pass to avoid heavy build at the ends of the stroke.

A card sprayed to check the fan; a balanced cigar shape means the gun is set up and clean, a split or heavy-end shape means a clogged/damaged cap or tip.

An inline device that removes water and oil from compressed air, preventing fisheyes and blistering caused by contaminated air.

A device that sets and holds the atomizing air pressure delivered to the gun.

Controlled, filtered airflow (often ~100–125 fpm down-draft) that removes overspray and keeps the finish clean.

Disassembling and thoroughly cleaning all gun parts after every use so dried paint never clogs the passages and distorts the pattern.

A cup with a calibrated orifice used to measure paint viscosity by timing how long the paint drains through it.

Breaking paint into a fine mist of droplets; poor atomization (low pressure, gun too far) causes orange peel and dry spray.

The side projections on the air cap whose air jets flatten the round spray into an oval fan; clogged horns split the pattern.

The atomizing pressure measured at the air cap; HVLP rules often cap it near 10 psi to keep transfer efficiency high and emissions low.

A bleeder gun passes air continuously; a non-bleeder gun releases air only when the trigger is pulled (typical of production refinish guns).

Selecting a tip and cap set sized to the material — primer needs a larger orifice than base or clear for proper flow and atomization.

A distorted fan caused by a clogged or damaged air cap or fluid tip; clean or replace the part before spraying.

Clean, dry, regulated air feeding the gun; contamination or moisture in the line causes finish defects.

Adjusting fan, fluid, and air, then verifying on a test card, so the gun lays the correct film for the material being sprayed.

A mesh strainer used when filling the cup to remove lumps and debris that would clog the tip or land in the finish.

A cup gun carries a small amount of paint at the gun; a pressure pot feeds larger volumes through a hose for big jobs.

A two-layer finish: a thin, flat basecoat carries the color or effect, and a clear topcoat provides gloss, depth, and UV protection.

The color layer in a basecoat/clearcoat system; provides the color, metallic, or pearl effect and is sprayed thin and flat until cleared.

The unpigmented top layer that gives gloss, depth, and UV/chemical protection over the basecoat.

A finish that combines color and gloss in one product, applied without a separate clearcoat.

A finish of basecoat, a translucent mid-coat, and clearcoat used for many pearls and candies; the number of mid-coats must match to get the color right.

The translucent, often tinted layer in a tri-coat system that adds depth and the pearl/candy effect between base and clear.

Paint containing aluminum flake that changes appearance with viewing angle; flake orientation depends on application technique, so it affects the match.

Paint containing mica pigment that creates color-shifting, pearlescent effects; sensitive to coat count and application.

When two colors match under one light source but differ under another, because they reach the same color with different pigments.

An electronic instrument that reads a vehicle's actual color and calculates a matching (or corrected) paint formula.

A test card sprayed with the mixed color and clear to confirm the match under multiple lights before spraying the vehicle.

The manufacturer's color code (on the door jamb or a VIN plate) that identifies the factory formula and starting point for matching.

Weighing each toner on an electronic scale per the formula for precise, repeatable color — far more accurate than measuring by volume.

The precision scale used to weigh toners in a mixing system so the mixed color matches the formula.

Stirring or shaking toners before mixing because pigments settle and separate over time, which would otherwise throw off the color.

The shelved set of toners in a mixing room; toners are agitated regularly to keep color accurate.

The time that lets a coat's solvents evaporate before the next coat; too little traps solvent and causes solvent pop or pinholes.

A paint's resistance to flow, set by reduction; correct viscosity is needed for proper atomization and a smooth film.

The solvent that thins paint to spraying viscosity; graded fast or slow to match the booth temperature.

The component that cures two-component (2K) paints and clears; mixed in the correct ratio and matched to temperature.

Slow reducer for hot conditions (so paint flows before flashing), fast for cool — wrong speed causes runs, orange peel, or solvent pop.

Tapering new color into the surrounding finish so a spot repair is invisible, often with a blending solvent and clear over the whole panel.

A solvent used at the edge of a basecoat repair to melt the new color into the existing finish for a seamless transition.

The proportions of paint, reducer, and activator specified on the technical data sheet; correct ratio is essential to cure and finish.

The manufacturer's product sheet giving mix ratios, reducer/temperature charts, flash and recoat times, and film build.

An alternate factory formula for a color that accounts for production variation and fading; chosen to match the actual vehicle.

Even, overlapping passes that distribute color and metallic flake uniformly to avoid streaks and mottling.

How metallic flakes lie in the film; consistent gun distance and technique control it, which is critical to a metallic match.

The total dry thickness of the coatings; too little hides poorly, too much risks cracking and solvent pop. Set by coats and product.

Slightly adjusting a formula by adding small amounts of toner to fine-tune a match after a spray-out comparison.

A test panel sprayed with varying mid-coats (tri-coat) to determine the exact number of coats needed to match.

The number of coats needed for the basecoat to fully cover the undercoat; influenced by color and the sealer shade beneath it.

A tinted sealer matched to the topcoat so fewer color coats are needed and coverage is uniform.

The time range in which the next coat can be applied without sanding; outside it, the surface may need scuffing for adhesion.

The usable time after a 2K product is activated before it begins to gel and must be discarded.

Film thickness per pass; wet coats flow but risk runs, medium coats are safer — chosen to suit the product and conditions.

Coating thickness measured in mils (thousandths of an inch); checked with a gauge to stay within the product's recommended build.

Evaluating a match in daylight (plus other lights) because shop fluorescents alone can hide metamerism.

Uneven color bands from poor overlap or arcing; prevented by consistent 50% overlap and gun motion.

A light, higher-distance final base coat used to even out metallic flake and reduce mottling.

A two-component clearcoat cured by an activator, giving durable gloss and chemical/UV resistance.

A measuring tool or chart for combining paint, reducer, and activator in the correct proportions by volume when not weighing.

The transitional area where new color is feathered into old; kept within a panel where possible and cleared overall.

Agitating paint and toners thoroughly before use so settled pigment is fully re-dispersed for accurate color.

Extending the clearcoat (and sometimes a little color) into a neighboring panel to hide a slight color difference.

Spraying a letdown panel with increasing pearl/mid-coats to find the exact coat count that matches a tri-coat color.

How a metallic or pearl color shifts from a head-on (face) view to an angled (flop) view; matched by application as well as formula.

A sealer both improves adhesion to the undercoat and gives uniform color holdout so the topcoat covers evenly.

A coating that cures by chemical reaction when an activator is added, giving durable, solvent-resistant films (most modern clears and primers).

Paint flowing downward because too much material was applied in one coat — over-reduced paint, gun too close, or too slow a reducer. Let cure, sand, re-spray.

A bumpy, low-gloss texture from poor flow-out — low pressure, gun too far, paint too thick, or fast reducer. Cured by sanding and buffing or re-clearing.

A rough, powdery surface from the gun held too far or air pressure too high, so paint partly dries before reaching the panel.

Small bubbles or craters from solvent trapped under a skinned-over coat — too little flash time, heavy coats, or too fast a reducer. Sand and refinish.

Tiny holes from trapped air or solvent escaping through wet paint, often over an unclean or porous surface; sand and reapply.

Uneven, blotchy metallic flake distribution from inconsistent gun distance, pressure, or motion; cured by uniform overlapping passes.

Light and dark stripes in a metallic finish from non-uniform gun movement; prevented by consistent distance, overlap, and a drop coat.

The topcoat shriveling because it was recoated too soon and its solvents penetrated and swelled the underlayer.

Adding too much reducer, lowering viscosity so the paint runs and sags and loses hiding.

Recoating before solvents evaporate, trapping them and causing solvent pop, pinholes, and dieback.

Holding the gun nearer than ~6 inches, depositing too much material in a band and causing runs and sags.

Holding the gun beyond ~8 inches, so paint partly dries in flight — dry spray, orange peel, and mottling.

Using a reducer too fast for the heat (dry spray, orange peel) or too slow for cool conditions (runs, solvent pop).

Color-sanding a textured area smooth, then buffing to restore gloss — the cure for minor orange peel and nibs.

The remedy for solvent pop and many application defects: let the film fully harden, sand the area, and re-spray.

Keeping a steady 50% overlap and gun speed to distribute metallic evenly and prevent mottling and tiger striping.

Moving the gun parallel and at constant distance so film and flake are even; the fix for striping and mottling.

Applying coats too heavy or too many, which invites runs, solvent pop, and later cracking; stay within the product's build.

Applying the next coat before the previous one has flashed/cured, trapping solvent and causing lifting, wrinkling, or solvent pop.

A small crater where wet paint pulls away from silicone or oil contamination. Stop, clean with wax-and-grease remover, and add fisheye eliminator.

An additive that lowers paint surface tension so it can flow over minor silicone contamination and resist fisheyes.

Bubbles under the finish from moisture or contaminants trapped during prep, or from poor surface preparation. Remove the source, then strip and refinish.

Loss of adhesion between layers or to the substrate, usually from a missed scuff, a dirty surface, or incompatible materials.

A milky, cloudy haze from moisture trapped when spraying in high humidity with a fast solvent. Use a slower (anti-blush) reducer.

A network of cracks from a film applied too thick or recoated too soon, stressing the coating as it cures and contracts.

A faded, powdery surface on aged paint from prolonged UV exposure breaking down the binder.

Dulling over time as UV breaks down the paint's chemistry; worsened by under-cured or low-quality film.

Color from an incompatible underlayer (often old red) migrating up into the new topcoat, causing discoloration; sealed with a bleeder sealer.

Bubbles/craters from trapped solvent escaping the curing film; caused by too little flash, heavy coats, or baking too soon.

A gradual loss of gloss after the finish dries, caused by solvent continuing to escape from an under-flashed film.

Wrinkling/swelling of an underlayer when a topcoat's solvents attack it — from incompatible products or recoating too soon.

Coarse sand scratches that show through the finish because solvents swelled them; prevented by finer final sanding and adequate flash.

A visible ring around a repair where solvents swell or telegraph a featheredge; reduced by a smooth taper and proper sealing.

Spots etched into a fresh finish by water (or contaminants) settling before full cure; avoided by protecting the finish until cured.

Specks embedded in the finish from a dirty environment; nibbed out and buffed, or sanded and re-cleared.

Surface or air-line silicone and oil that cause fisheyes and adhesion loss; controlled by clean prep, clean air, and keeping silicone away.

Blotchy metallic in the cured finish from uneven application; corrected by re-spraying with uniform technique.

A shriveled surface from recoating before the underlayer dried or from incompatible coatings.

Bubbling and lifting from rust spreading beneath the finish, caused by unprotected bare metal or trapped moisture.

Paint failing to bond from inadequate scuffing, contamination, or incompatible undercoats; prevented by correct prep.

Spotting and dulling from acid rain, bird droppings, or chemicals attacking the finish; severe cases must be sanded and refinished.

Diagnose the cause (contamination, moisture, incompatibility, technique, or age) before re-spraying — fixing the symptom alone repeats the defect.

A visible halo around a repair from improper featheredging or sealing showing through; corrected by reworking the edge.

Texture in the cured finish from poor flow-out; corrected by color-sanding and buffing or sanding and re-clearing.

Cured runs from too-heavy application; sanded flat and the area re-sprayed.

A cloudy clearcoat from moisture or solvent issues; tied to blushing and improper reducer for conditions.

A finish that stays soft because of wrong activator ratio, low temperature, or insufficient cure time, leading to poor durability.

Fine surface cracks resembling a bird's foot from excessive film thickness or stress in the topcoat.

Overspray dust landing on a wet adjacent finish; controlled by masking and booth airflow.

Cutting through the color or primer to a lower layer while sanding; requires re-priming or re-coloring the spot before clear.

Reactive chemicals in 2K urethane paints and clears that can cause asthma and respiratory sensitization; spraying them requires a supplied-air respirator.

A respirator that feeds clean air from a source outside the contaminated area; required when spraying isocyanate-containing materials.

For paint vapors and isocyanates, a supplied-air respirator is required because cartridge filters and dust masks don't reliably stop the vapor.

A filter respirator for dust and sanding particles — not adequate for isocyanate paint vapors.

Gloves worn when mixing and handling paints and hardeners to protect skin from chemicals that can irritate or sensitize.

Goggles or a face shield worn to guard against paint and solvent splashes that can injure the eyes.

A ventilated, filtered enclosure with proper exhaust that carries overspray and vapors away from the breathing zone.

The most effective way to reduce solvent-vapor inhalation by capturing and removing vapors at the source.

A labeled, fire-rated cabinet for storing flammable solvents and paints away from ignition sources.

The extinguisher type suited to a paint shop, handling flammable-liquid (Class B) and electrical (Class C) fires.

Connecting the booth and vehicle to ground to dissipate static electricity that could ignite paint fumes and solvents.

Cleaning spray guns with solvent in a well-ventilated area to avoid inhaling harmful solvent vapors.

The document listing a product's hazards, PPE, storage, and spill procedures; consulted for every refinish material.

Ventilate the area first to disperse vapors and reduce fire/health risk, then clean up per the SDS.

Storing solvent-soaked rags in a closed, self-closing metal waste can to prevent fire from spontaneous combustion.

Respirator, chemical-resistant gloves, suit, and eye protection worn to guard against refinish hazards.

Isocyanates can absorb through skin, so a suit and chemical-resistant gloves are needed in addition to a respirator.

Keeping flammable and reactive materials labeled, segregated, and in proper cabinets per regulations and the SDS.

Filters that capture overspray and vent vapors, key to minimizing exposure to isocyanates and solvents.

Limiting volatile organic compound release through HVLP guns, proper products, and booth controls per environmental rules.

Confirming the booth draws air inward (slight negative pressure) so overspray and vapors are exhausted, not pushed into the shop.