SkillsUSA Automotive Refinishing Technology Practice Test

Which step should precede painting bare aluminum to promote adhesion?

Polish to a high shine and apply clearcoat. Apply topcoat directly. Clean, etch or abrade lightly, and apply a suitable adhesion-promoting primer. Use wax as a primer.

Correct Answer:

Clean, etch or abrade lightly, and apply a suitable adhesion-promoting primer.

Explanation:

Bare aluminum won’t hold paint well until its surface is prepared to bond. The best step is to clean the surface to remove oils and contaminants, then etch or abrade lightly to create a tiny surface roughness, and finally apply a suitable adhesion-promoting primer designed for aluminum. Cleaning removes substances that would block bonding; etching or light abrasion disrupts the oxide layer and gives the primer something to grip; the adhesion-promoting primer provides the chemical and mechanical bonding needed for the paint to stick and last. Polishing to a high shine makes the surface too smooth for good adhesion, applying topcoat directly skips the critical primer layer, and wax isn’t a real primer and won’t promote bonding.

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