[jbond]

If you have an auto spray painter you can use automotive epoxy primer. I've used PPG DPLF epoxy primer to seal an Airstream Frame. Both DPLF and POR15 when dry, seal the metal underneath from air and thus stop the oxidation process. DPLF is a 2 part paint that "chemically" drys or hardens.

I also use POR15. Both work very well. I use DPLF when I can spray the metal and use POR when a paint brush is more suitable. I never put POR in my paint gun.

If you buy POR15, buy the POR solvent to use to cleanup with. I think its lacquer thinner.