67500 To protect your aluminium body either multi layers of undercoating or that newer stuff out Lizard skin. I added 4 coats to the rear wheel wells for my car. Tape everything off and have a nice day to spray it on. NO BREEZE DAY and a temp in the 60-70's. Repeat and apply. Rhino bedliner would be the other idea, the colors include silver and it is thick after setup. About 1/2" The other choise is carrying a smooth hammer and dolly for the body work.
ONLY kidding. 3M will glue just about anything to any thing, but you have to watch the heat area. It also doesnot like water and breaks down over time. Rick L.