After applying the first coat of a clear finish, what should you do before applying the next coat?

• A. Let the surface dry longer without sanding.
• B. Apply the next coat immediately without any prep.
• C. Sand lightly before applying the next coat.
• D. Wipe with solvent and recoat.

Answer: (C)

Between coats, lightly sanding the surface is the key step. This creates a micro-roughness on the first coat that gives the next layer something to grip, helping the finish bond properly and resulting in a smoother final look. Use a fine grit, like 320 to 400, and sand with the grain. Don’t press hard or sand through the first coat; you’re aiming for a gentle scuff that removes any dust nibs or slight imperfections. After sanding, wipe away all dust with a tack cloth or damp wipe and let the surface be clean before applying the next coat.

Skipping this step can leave a polished surface with poor adhesion, which may lead to peeling or uneven layers. Applying the next coat immediately without prep skips the essential bonding surface, and wiping with solvent between coats isn’t the standard practice for most sealers and finishes, as solvents can soften or distort the first layer.