COLLISION REPAIR
PRACTICE EXAM
COMPLETE ASE B2-B5 250
QUESTIONS
Question 1: Before sanding a collision-repaired panel, what should the re�nisher do �rst to reduce the chance of driving wax or road contaminants into the surface?
Choices:
1) Dry sand the panel with coarse abrasive 2) Thoroughly clean the panel with the recommended cleaners 3) Apply a guide coat over the entire panel 4) Spray primer-surfacer over the contaminated �nish
Correct Answer: Thoroughly clean the panel with the recommended cleaners
Explanation: Cleaning before sanding removes wax, silicone, road �lm, and other contaminants that could be ground into the �nish and later cause adhesion or �sheye problems.Page 1
Question 2: A steel panel has light surface corrosion extending beyond the visible paint chip. What is the best preparation before applying re�nishing materials?
Choices:
1) Cover the corrosion with primer-sealer to isolate it 2) Apply body �ller directly over the corroded area 3) Featheredge only the paint around the rust and leave the metal unchanged 4) Remove the corrosion to sound substrate and treat the exposed metal as speci�ed Correct Answer: Remove the corrosion to sound substrate and treat the exposed metal as speci�ed Explanation: Corrosion must be removed to sound material. The exposed substrate then receives the treatment or undercoat speci�ed for that metal and re�nishing system.Question 3: Why should the substrate type be identi�ed before choosing an undercoat?
Choices:
1) Di�erent substrates can require di�erent cleaners, primers, or adhesion treatments 2) All modern substrates accept the same primer without preparation di�erences 3) Substrate type determines the vehicle's paint code 4) Only aluminum panels require any undercoat Correct Answer: Di�erent substrates can require di�erent cleaners, primers, or adhesion treatments Explanation: Bare steel, galvanized steel, aluminum, plastics, and existing �nishes can require di�erent preparation and undercoat procedures. Correct identi�cation prevents adhesion and corrosion problems.Page 2
Question 4: What is the main purpose of featheredging a sanded paint edge?
Choices:
1) Make a sharp edge that is easy to mask 2) Remove all factory �nish from the complete panel 3) Create a smooth gradual transition from exposed substrate to the existing �nish 4) Increase gloss before primer is applied Correct Answer: Create a smooth gradual transition from exposed substrate to the existing �nish Explanation: Featheredging removes a hard paint edge and produces a gradual transition so primer and topcoat can be applied without a visible ridge.
Question 5: A primer-surfacer has been applied over a repaired area. Which
procedure best helps reveal remaining highs, lows, and sanding scratches during block sanding?
Choices:
1) Wet the entire panel with solvent while sanding 2) Apply a light guide coat before block sanding 3) Apply clearcoat as a temporary inspection layer 4) Polish the primer before sanding
Correct Answer: Apply a light guide coat before block sanding
Explanation: A contrasting guide coat remains in low spots and scratches while sanding, making surface irregularities easier to see and correct.Page 3