How did you rustproof your bottom?

MoparMike1974 said
I have been doing epoxy primer then raptor bedliner thinned 10%. It lays out very fine texture when thinned. Of course if your into OE restoration this route is not for you. Grey is epoxy, black is bedliner and thrid pic is close up showing the texture.
Pics are my friends 67 b'cuda im working on.

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That looks fantastic and is exactly what I'd like mine to look like. Unfortunately, I'd have to disassemble the car and put the shell on a rotisserie, which is a show stopper for me. But yeah, in a perfect world, I'd like my underside to look just like that. Very nice work - my compliments!