Sand Between Coats (if needed)

What happens here

Allow the first coat of spar urethane to dry completely according to the manufacturer's instructions. Once dry, gently run your hand over the entire door surface to check for any rough spots or raised grain. If any imperfections are detected, lightly sand those areas with a very fine sanding sponge until smooth. This ensures a perfectly smooth surface for the subsequent coat.

Goal: After the first coat dries, inspect for any rough spots and lightly sand them smooth for an optimal final finish.