Has anyone had any success with using any undercoating on the aluminum panels? Any prep work need to be done to them to have good adhesion? WalMart and a few local auto parts stores have a roll-on truck bedliner that looks like it may work ok. Ideas?
Just seal the underside of the body with a good cheap black epoxy rolled on first, then use the truck bed liner only in the fender wells in very heavy application for stone "checking" protection.
I would not use use the liner plastic all over for weight reasons and never over raw fiberglass surfacing.
I would NOT recommend the rubberized spray-on undercoat from a can. It provides very little protection and will melt like an ice cube on a hot sidewalk when hit with oil or grease. I got talked into using it on the underside of my aluminum and I've been sorry ever since. Use the bedliner. Mucho better.
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