20 Final Prep & Protective Coatings Practice Questions & Answers

Every Final Prep & Protective Coatings practice question from the ASE B2 Painting & Refinishing Practice Test, with the correct answer and a short explanation.

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1. After final sanding of a fender and before chemical cleaning, a painter blows the panel off with compressed air. Which practice is correct?
- A.Skip the blow-off and rely on tacking, since the tack cloth removes all sanding dust
- B.Blow off only the flat face of the panel, since the gaps and jambs will be masked
- C.Use air straight from the shop line, since the cleaner will remove any oil it carries
- D.Use clean, filtered, dry air from the top down, blowing out gaps, seams and jambs✓ Answer
Dust removal is its own step after sanding: clean, dry, filtered air worked from the top down clears residue, and gaps, seams, jambs and masking folds must be blown out because trapped dust is later blown onto the wet paint as dirt nibs. Oily or wet line air contaminates the surface, and tacking supplements blow-off rather than replacing it.
Ref QB-EAVAAZSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (remove dust residue from area to be refinished)Report a problem with this question
2. Painter A says dust left in door jambs, moldings and masking folds should be blown out before spraying, because it can be blown onto the wet paint. Painter B says that once the area has been thoroughly blown off, tacking before spraying is unnecessary. Who is right?
- A.A only✓ Answer
- B.Neither A nor B
- C.Both A and B
- D.B only
Painter A is right: dust trapped in jambs, moldings and masking folds is a classic source of dirt nibs because the gun's air dislodges it onto the fresh film. Painter B is wrong: blowing off removes loose residue, but a final light tack immediately before spraying is still needed to lift remaining dust and lint.
Ref QB-WSP5QYSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (remove dust residue; remove dust or lint with a tack cloth)Report a problem with this question
3. Before applying waterborne basecoat, a painter wants a final wipe that removes sanding residue, fingerprints and salts. Which cleaner is generally recommended, per the paint maker's TDS?
- A.A lacquer thinner wipe, because it dissolves every kind of residue quickly
- B.A urethane reducer wipe, because it flashes off faster than any cleaner
- C.A waterborne cleaner, because it lifts water-soluble residue such as salt✓ Answer
- D.A dry paper towel only, because any liquid can leave residue under base
Solvent wax-and-grease remover dissolves oils, wax and silicone, but water-soluble contaminants such as sanding residue, fingerprints and salts are removed by a waterborne cleaner, which paint makers commonly specify as the final wipe before waterborne base. Lacquer thinner or reducer is not a cleaner and can attack finishes and plastics, and a dry towel only moves residue and builds static.
Ref QB-DAHY4YSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (clean area using proper cleaning solutions); paint manufacturer technical data sheet practiceReport a problem with this question
4. A painter wipes wax-and-grease remover onto a hood and lets it evaporate before wiping. After basecoat, small round craters appear across the panel. What is the most likely reason?
- A.The basecoat went on too dry, which always leaves craters on a clean panel
- B.The cleaner was strong enough to etch the finish, so base could not flow
- C.The dissolved contaminants were redeposited when the cleaner dried in place✓ Answer
- D.The panel was cleaned before sanding, when it should be cleaned only after
Cleaner dissolves wax, oil and silicone but must be wiped off with a second clean, dry cloth while still wet; if it evaporates on the panel, the dissolved contaminants are left behind and cause fisheyes. Cleaning before sanding is correct practice, because sanding a contaminated panel drives silicone into the scratches.
Ref QB-VSBTHXSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (clean area using proper cleaning solutions); I-CAR refinish training principles, two-cloth cleaning methodReport a problem with this question
5. Painter A says a tack cloth should be pressed firmly against the panel so it picks up every bit of lint. Painter B says a standard resin tack cloth is the preferred choice right before waterborne basecoat. Who is right?
- A.Neither A nor B✓ Answer
- B.B only
- C.A only
- D.Both A and B
Neither is right. Heavy pressure transfers tack resin onto the surface, which can cause smears, fisheyes or adhesion problems, so the cloth is loosely folded and drawn lightly. A standard resin tack cloth can leave residue that waterborne base will not tolerate, so a waterborne-compatible or low-tack cloth is used instead.
Ref QB-CA6NXWSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (remove, with a tack cloth, any dust or lint particles)Report a problem with this question
6. At what point in the final preparation sequence should a painter use the tack cloth on a panel about to receive basecoat?
- A.Immediately before spraying, after masking and the final cleaning are complete✓ Answer
- B.Right after final sanding, before the blow-off and before any chemical cleaning
- C.Before masking, so the paper and tape cannot trap any residue from the cloth
- D.While the cleaner is still wet, so the cloth can lift the dust out of the cleaner
The normal order is sand, blow off, clean, mask, tack, spray. Tacking last removes dust and lint that settle during masking and handling, and tacking a surface still wet with cleaner smears resin and contaminants into the film.
Ref QB-USYFCWSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (remove, with a tack cloth, any dust or lint particles)Report a problem with this question
7. A new replacement bumper cover is raw, unprimed TPO plastic. It has been washed, cleaned with plastic cleaner, scuffed and cleaned again. What should be applied next?
- A.Self-etching primer in a medium coat, since its acid bites into plastic
- B.Adhesion promoter in a thin wet coat, observing the TDS recoat window✓ Answer
- C.Primer-surfacer in heavy coats, so it can be block sanded before sealing
- D.Metal conditioner wiped on and off, so the plastic accepts the undercoat
Raw TPO and PP plastics have low surface energy, so paint will peel unless an adhesion promoter is applied in a thin wet coat and topcoated within the recoat window on the TDS. Self-etch primer and metal conditioner are chemistries meant for bare metal, and primer-surfacer is a high-build product, not an adhesion layer for raw plastic.
Ref QB-BATASVSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (apply primer-sealer and/or adhesion promoter)Report a problem with this question
8. Painter A says primer-sealer is a high-build product designed to be block sanded before basecoat. Painter B says that if the primer-sealer's recoat window on the TDS has been exceeded, it should be scuffed and resealed before basecoat. Who is right?
- A.Neither A nor B
- B.Both A and B
- C.A only
- D.B only✓ Answer
Only Painter B is right. Primer-sealer is usually a wet-on-wet, non-sanding product sprayed just before basecoat to give adhesion, uniform holdout and solvent isolation; once its recoat window passes, it no longer bonds chemically and must be scuffed and resealed. The high-build, block-sanded product Painter A describes is primer-surfacer.
Ref QB-3TFTJ6Source: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (apply primer-sealer and/or adhesion promoter); paint manufacturer technical data sheet practiceReport a problem with this question
9. While removing a dirt nib from dried primer-sealer, a painter sands through to the primer-surfacer underneath. What should be done before basecoat?
- A.Spray clearcoat on the spot first, so the base sits on a uniform clear layer
- B.Polish the spot with compound so its gloss matches the surrounding sealer
- C.Apply basecoat directly, since extra base coats will hide the sand-through
- D.Reseal the sand-through spot, then clean and tack it again before the base✓ Answer
A sand-through leaves a spot with different color and solvent holdout than the sealed area, so basecoat would show a different shade or uneven absorption there. Resealing restores a uniform undercolor and holdout, and the spot must be cleaned and tacked again before base.
Ref QB-JAANY5Source: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (remove imperfections from primer-sealer)Report a problem with this question
10. All of these are correct when removing a dirt nib from primer-sealer EXCEPT:
- A.Using a coarse abrasive so the nib is leveled in a single pass✓ Answer
- B.Using a very fine abrasive and removing only the defect itself
- C.Cleaning and tacking the area again before applying basecoat
- D.Waiting until the sealer has dried or flashed as the TDS directs
A coarse abrasive leaves scratches that swell or show through the basecoat and makes sand-through of the thin sealer likely. Nibs are removed only after the sealer has dried per the TDS, with a very fine abrasive limited to the defect, followed by cleaning and tacking.
Ref QB-XSMPDWSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (remove imperfections from primer-sealer)Report a problem with this question
11. Color will be blended into an adjacent door, and the whole door will be cleared. How should the adjacent door be prepared?
- A.Clean it only, since base and clear will bond to the intact factory gloss
- B.Sand it with the featheredging grit, so the blend edge is fully hidden
- C.Clean it first, then scuff it to remove all gloss where clear will go✓ Answer
- D.Scuff it first, then clean it, since cleaning before scuffing is wasted
Cleaning before scuffing keeps wax and silicone from being driven into the scratches, and every area that will receive clear must have its gloss removed, because shiny spots lose adhesion and delaminate. The blend area is scuffed with a finer abrasive than the one used to featheredge, per the TDS.
Ref QB-FATUYWSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (prepare adjacent areas for blending)Report a problem with this question
12. A dent near the sail area of a quarter panel is being refinished. Painter A says the clear should be extended to the nearest natural breakpoint or panel edge. Painter B says small shiny spots may be left in the area receiving clear, as long as the color-blend area is fully scuffed. Who is right?
- A.B only
- B.Both A and B
- C.A only✓ Answer
- D.Neither A nor B
Only Painter A is right. Clear is carried to a natural breakpoint or panel edge rather than blended within a small area, which gives a durable, invisible edge. Every area that will receive clear must be scuffed dull, because clear over remaining gloss can peel.
Ref QB-WS9C8VSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (prepare adjacent areas for blending)Report a problem with this question
13. The OEM stone-chip coating on a rocker panel has a coarser texture than the painter's first test spray. Which adjustment will make the texture coarser?
- A.Raise the air pressure and hold the gun closer to the panel
- B.Thin the coating heavily so it spatters in larger droplets
- C.Lower the air pressure or hold the gun farther from the panel✓ Answer
- D.Apply one heavy wet coat, since more film adds more texture
With a chip-resistant coating gun, less atomization produces larger droplets and a coarser texture, so lowering pressure or increasing distance coarsens it, while higher pressure and a closer gun make it finer. Heavy reduction or one flooded coat flows out smooth instead of duplicating the OEM texture.
Ref QB-EAFHTVSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (apply stone-chip resistant coating)Report a problem with this question
14. Painter A says stone-chip resistant coating on lower body panels is normally applied over primer and then topcoated with color, per the OEM and the product's TDS. Painter B says the upper edge of the coating should be masked at the same height as the OEM application. Who is right?
- A.A only
- B.Neither A nor B
- C.B only
- D.Both A and B✓ Answer
Both are right. Chip-resistant coatings on rockers, lower doors and valances usually go over primer before color so they are topcoated, and a tape line at the OEM height reproduces the factory appearance. This flexible lower-body coating is different from underbody undercoating or sound deadener.
Ref QB-ZSBCRYSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (apply stone-chip resistant coating); OEM repair proceduresReport a problem with this question
15. A rocker panel and an inner door panel were replaced. At what point in the repair should cavity wax be applied to their enclosed sections?
- A.Before priming, so the wax seals bare metal before the undercoat goes on
- B.After refinishing is complete, so the wax cannot contaminate the new paint✓ Answer
- C.Between sealer and basecoat, so overspray locks the wax into the seams
- D.Before welding, so the wax flows into the flanges ahead of the spot welds
Cavity wax is applied through a wand with a 360-degree nozzle after refinishing, because wax on surfaces still to be welded or painted causes weld contamination and fisheyes. Drain holes are left open, and any OEM corrosion protection removed during repair is restored per OEM procedures.
Ref QB-HAHHBZSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (apply corrosion resistant coatings to repaired areas); OEM repair proceduresReport a problem with this question
16. All of these are correct practices for weld-through primer EXCEPT:
- A.Applying it to mating flanges that will be spot welded, where the OEM allows
- B.Following OEM repair procedures on whether it may be used on that vehicle
- C.Removing it from exposed surfaces after welding, then applying proper primer
- D.Applying it to all exposed bare metal as a substitute for epoxy primer✓ Answer
Zinc-rich weld-through primer protects mating flanges that will be welded, but it is not a substitute for epoxy or other corrosion-resistant primer and is not meant to be topcoated. It belongs only where welding will occur, must be removed from exposed areas afterward, and is used only as the OEM permits.
Ref QB-YSYZJXSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (apply corrosion resistant coatings to repaired areas, weld-through areas); OEM repair proceduresReport a problem with this question
17. A painter must remove an OEM tape stripe from a door that will be refinished. Which removal method is recommended?
- A.Warm it with low heat, peel it at a low angle, then remove the adhesive residue✓ Answer
- B.Sand it off with coarse paper, then featheredge the area before refinishing it
- C.Soak it with lacquer thinner so the adhesive dissolves before the stripe peels
- D.Heat it until very hot, so the stripe and adhesive release in a single pull
Gentle heat softens the adhesive without blistering the paint, peeling slowly at a low angle limits tearing, and an eraser wheel used without heat buildup handles stubborn stripes. Leftover adhesive is then removed with adhesive remover and wax-and-grease remover; excess heat or strong solvent damages the finish.
Ref QB-GA676YSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (remove and apply decals, transfers, tapes and pinstripes)Report a problem with this question
18. Painter A says the location of a graphic should be recorded with tape reference marks, measurements or photos before it is removed. Painter B says a large graphic is best applied with an application solution so it can be positioned, then squeegeed from the center outward. Who is right?
- A.A only
- B.Both A and B✓ Answer
- C.B only
- D.Neither A nor B
Both are right. Recording placement before removal lets the new graphic go back exactly where the factory put it, and wet application lets a large graphic slide into position before squeegeeing from the center out pushes the fluid and air to the edges. The fresh paint must also be cured enough per the paint maker before any graphic goes on.
Ref QB-3T2243Source: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (remove and apply decals, transfers, tapes and pinstripes)Report a problem with this question
19. On a dry winter day, silver metallic base is sprayed on a plastic bumper cover and an adjacent steel fender. Only the bumper shows heavy dirt and blotchy, uneven metallic. Which of these could cause this?
- A.Gun held too far from the steel fender, causing dry spray at the bumper
- B.Static charge built up on the plastic by wiping it with a dry cloth✓ Answer
- C.Sealer applied too thin on the steel, so the fender absorbed the base
- D.Mold release left on the plastic, which repels the base as fisheyes
Plastic builds static charge when wiped with dry cloths in low humidity; the charge pulls dust and lint into the finish and can disturb metallic flake orientation, giving mottling on the plastic part only. Mold release causes cratering rather than dirt plus mottling, and problems on the steel panel would not appear only on the bumper.
Ref QB-KA87P3Source: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (take appropriate measures to eliminate static electricity)Report a problem with this question
20. All of these help control static electricity on plastic parts before refinishing EXCEPT:
- A.Wiping with anti-static or waterborne cleaner as the final cleaning step
- B.Rubbing the part briskly with a dry tack cloth just before spraying✓ Answer
- C.Using an ionizing blow-off gun to neutralize the charge before spraying
- D.Grounding the vehicle and the part stand with a proper ground strap
Brisk rubbing with a dry cloth is exactly what builds static on plastic, which then attracts dust and lint to the fresh paint. Anti-static or waterborne cleaners, ionizing blow guns and grounding of the vehicle and part stand all dissipate the charge.
Ref QB-APKGMYSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (take appropriate measures to eliminate static electricity)Report a problem with this question

1. After final sanding of a fender and before chemical cleaning, a painter blows the panel off with compressed air. Which practice is correct?

2. Painter A says dust left in door jambs, moldings and masking folds should be blown out before spraying, because it can be blown onto the wet paint. Painter B says that once the area has been thoroughly blown off, tacking before spraying is unnecessary. Who is right?

3. Before applying waterborne basecoat, a painter wants a final wipe that removes sanding residue, fingerprints and salts. Which cleaner is generally recommended, per the paint maker's TDS?

4. A painter wipes wax-and-grease remover onto a hood and lets it evaporate before wiping. After basecoat, small round craters appear across the panel. What is the most likely reason?

5. Painter A says a tack cloth should be pressed firmly against the panel so it picks up every bit of lint. Painter B says a standard resin tack cloth is the preferred choice right before waterborne basecoat. Who is right?

6. At what point in the final preparation sequence should a painter use the tack cloth on a panel about to receive basecoat?

7. A new replacement bumper cover is raw, unprimed TPO plastic. It has been washed, cleaned with plastic cleaner, scuffed and cleaned again. What should be applied next?

8. Painter A says primer-sealer is a high-build product designed to be block sanded before basecoat. Painter B says that if the primer-sealer's recoat window on the TDS has been exceeded, it should be scuffed and resealed before basecoat. Who is right?

9. While removing a dirt nib from dried primer-sealer, a painter sands through to the primer-surfacer underneath. What should be done before basecoat?

10. All of these are correct when removing a dirt nib from primer-sealer EXCEPT:

11. Color will be blended into an adjacent door, and the whole door will be cleared. How should the adjacent door be prepared?

13. The OEM stone-chip coating on a rocker panel has a coarser texture than the painter's first test spray. Which adjustment will make the texture coarser?

14. Painter A says stone-chip resistant coating on lower body panels is normally applied over primer and then topcoated with color, per the OEM and the product's TDS. Painter B says the upper edge of the coating should be masked at the same height as the OEM application. Who is right?

15. A rocker panel and an inner door panel were replaced. At what point in the repair should cavity wax be applied to their enclosed sections?

16. All of these are correct practices for weld-through primer EXCEPT:

17. A painter must remove an OEM tape stripe from a door that will be refinished. Which removal method is recommended?

18. Painter A says the location of a graphic should be recorded with tape reference marks, measurements or photos before it is removed. Painter B says a large graphic is best applied with an application solution so it can be positioned, then squeegeed from the center outward. Who is right?

19. On a dry winter day, silver metallic base is sprayed on a plastic bumper cover and an adjacent steel fender. Only the bumper shows heavy dirt and blotchy, uneven metallic. Which of these could cause this?

20. All of these help control static electricity on plastic parts before refinishing EXCEPT:

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