I have a very rusty 72 cruiser that I want to make into a mountain cruising tank. I don't want to go to car shows I want it tuff. I have read many links about owners that have put various liner paints in the interior, but has anyone done anything similar to the exterior? I was thinking of doing something like, major rust repair, por15 as a first coat and then possibly a flat coat or some type of liner coat for a final coat, am I crazy??