I'll second that about the Rust-Oleum wet sandable primer. When I've finished stripping the rust and paint off an area, I'll spray it right away. In the beginning...I was spraying some WD-40 on a rag and wiping it down to keep it from flash rusting, everybody in here set me straight on that. DON'T DO IT! I removed the WD-40 with some degreaser, then primered it.

http://community.webshots.com/user/mummdogg