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The bolts are already rusty and it’s easier to replace than to try and de-rust bolt heads. Phosphoric acid? I’ll check it out, thanks

A lot of the bolts on my truck are rusted. I was going to replace them before painting with either Hot dipped galvanized or the shiny zinc. I know painting over galvanized is tricky, but what’s the best primer or pre-treatment?? some humvee frames Are galvanized so the military must have a...