Surface rust prep before sound deadning

str12-340 said

It isn't like this is something that you can't get to. You are about to cover it with a water impermeable barrier which means that any moisture that gets between the floor and the insulation is trapped against the floor. IMHO - Take a grinder with a wire cup and strip the floor, protect with epoxy primer and good enamel paint.

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With that line of thinking, just leave it bare metal, because paint is also water impermeable. You also trap moisture when you paint. Nothing you can do about it. Metal must have oxygen to rust. Seal it and no rust will take place. That's not opinion, that's scientific fact.

That's why you can take a car 60 years later, scrape off the factory undercoating and the floor is perfect. Had they done that on BOTH sides, the inside would be just as perfect.

As for sound deadener, I look at it as permanent. Why in hell would I ever want to remove it?