Hello all; It has always been my opinion that regardless of what you use for rust paint it is always a good idea to remove the scale down to bare metal. I have heard much of P.O.R 15 and Corroless but has anyone tried coal tar epoxy? A fellow that I know up the street is painting Land Rover frames with this substance, he says that they use it on the hulls of bumper boats at the pulp mill. This is under conditions of continuous bashing in salt water so it would likely do a good job with rust proofing a car body. Perhaps P.O.R 15 is coal tar epoxy, anyone know? Another substance that I have been meaning to try is marine enamel since I happen to have a few cans of it. Marine enamel seems to be a good quality paint which is designed to take a lot of abuse. It would undoubtedly have a good resistance to water as well. I have also found some polyurethane paint that might be worth a try. Best Regards Arran Foster 1954 Imperial Newport Needing A Left Side Taillight Bezel and other trim parts.