Primer for Perfect Paint
You can safely use Rustoleum, either the grey or the white, in spray cans. Sands nicely. I have even used the grey on the bottom side of warbirds as the final color, but I spray a light coat of Varathane Polyurethane over it so slight scratches don't "burnish" the finish. You can get it at K-Mart, Wal-Mart, etc.
Clair