I had a lot of doors to spray paint, and I needed a quick and easy stand to hold each one upright, so I could paint both sides without moving it. This stand, made from one 2×4 stud and a triangular base of 3/4-in. plywood, took about five minutes to build. Drive two nails up through the base to set the bottom edge of the door on. Drill a hole through the upper arm to allow an easily removable nail to be tapped into the top edge of the door. Paint the door bottom first if all the edges need to be sealed. — A. Westfall.
These tips will also help make painting a door a breeze.