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Sand smooth with a fine grit sanding sponge
One coat of paint usually won't hide the underlying color and sheen on trim. And if you don’t sand the surface smooth between coats, the finish may have a grainy texture. For a smooth finish, sand the trim before applying each coat of paint. Sand the trim with a fine-grit sanding sponge. Sponges get into crevices where sandpaper
can't go and let you apply even pressure. Then apply the first coat of paint, let it dry at least 24 hours, lightly sand it again for a completely smooth surface, and apply the second coat. After each sanding, vacuum the trim, then wipe it down with a tack cloth to remove the dust.