What is sealer used for?

• A. To create a uniform surface before topcoat
• B. To color-match edges
• C. To replace primer
• D. To remove old paint

Answer: (A)

Sealer is used to create a uniform surface before the color coat. After bodywork, the substrate can be porous or uneven, so the sealer fills tiny pores and smooths the surface, giving the topcoat a consistent background to adhere to and dry against. This helps prevent differences in shade or gloss across repaired and surrounding areas and improves adhesion of the final color coat. It’s not meant to replace primer, which provides protection and adhesion for bare metal, and it’s not for removing old paint. Some sealers can be tinted to help color matching, but the main purpose is to establish a uniform base for the topcoat.