How to Refinish a Door

After the finish has dried overnight, gently hand-sand it with 220-grit paper. (You don't want to sand through to bare wood.) Dust the door and wipe it down with a tack cloth. Brush on the second coat, following the same order, and let it dry overnight. Dust and sand with 280-grit paper, then put on the final coat. When that's dry, reattach the door hardware.