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SkillsUSA Automotive Refinishing Technology Practice Test

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What additive helps improve adhesion on plastic bumpers?
Correct Answer:
An adhesion promoter or bonding agent.
Explanation:
Improving adhesion to plastic bumpers relies on using an adhesion promoter. Plastic surfaces are often slick and chemically inert, so coatings won’t bond well without a bridging layer. An adhesion promoter provides that bridge, chemically bonding to the plastic on one side and giving the primer something to grab onto on the other, which improves wetting, bonding, and long‑term durability. This is especially important for common bumper plastics that resist adhesion, and it’s applied after proper cleaning and surface scuffing. A clearcoat additive changes finish properties, not the bond to plastic. A thinner solvent just reduces viscosity; it doesn't enhance adhesion. A retarder slows the cure, which can affect control of the coating but doesn’t improve adhesion to plastic.

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