Which term describes a primer layer placed before color application to create a uniform base and enhance adhesion, without sanding?

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A primer-sealer is used to prepare the surface before color, creating a uniform base and helping the color coat adhere. It seals the substrate, controls porosity, and levels minor imperfections so the topcoat goes on smoothly. This matches the description of a primer layer placed before color application to improve adhesion without needing sanding of the surface. Basecoat is the color layer itself, a surfacer is a heavier filler primer for smoothing, and an etching primer is aimed at bare metal to promote adhesion.