A door that rubs or catches, when opened and closed, is inconvenient and can damage your door, flooring, and your door frame. Fix it in a few easy steps.
Find the Problem Area
Establish the rubbing area by closing the door on a sheet of carbon paper. An ink mark will reveal the misaligned portion of the door edge.
Sand It Down
As you sand the misaligned area, be sure to work the area beyond it as well for a smooth surface.
Once the rubbing area has been made smooth, seal the door edge with several coats of varnish or paint.
Courtesy of Dremel Tools