Musings From A French Cottage: Infant of Prague Just paint your object gray. When it dries, brush over it with white gesso (small sections at a time - it dries quickly) and wipe off with a paper towel.
Frame Spray Painting Tip: place the frame in a box, and spray one side of it with your choice of spray paint. Leave it in the sun to dry, and then flip it over and spray the other side. Hell, spray EVERYTHING in a box from now on.