The Family Handyman
Use a drum sander in a hand drill to quickly create perfectly coped inside corners on molding. First, nail one molding piece in the corner so the end meets flush with the wall. Next, cut a 45-degree miter (if the corner is 90 degrees) on the corner end of the second molding piece, then clamp it to a steady work surface.With a coarse-grit sanding sleeve in an electric drill, sand away the mitered end. Be careful to sand only to the line, running the drum back and forth along the joint line to ensure a smooth contour. If your molding has intricate curves, use a rotary tool with a small drum sander to finish these areas. Test-fit, resand as necessary and nail on the second piece. Our thanks go to reader Jim McConville for this refined tip.