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Re: floor hump question
epoxy prime over clean bare metal, then a good single stage or two stage automotive paint. I like a couple thin coats of epoxy primer, and even sometimes do a single layer of another primer(simple filler for imperfections), just to make sure there is a good base. and I go extra layers with the top coat, if its not some sort of metallic you are trying to match.
some guys truck line it, but that can go bad if there is a pinhole-water gets underneath and just rusts the floor away without you realizing it.
a lot of the Por 15/Zero-rust/Rust Bullet products do best only over rusted metal, and not great with clean metal.
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