Quote:
Originally Posted by hot rod
Way back in the day we used a primer call zinc chromate from 3M on our stake body beds and tank trucks when we would sandblast and recondition them to go onto a new chassis. Sprayed over the freshly blasted metal the stuff was virtually indestructible. I remember after years of service the paint topcoat would eventually chip off inside the wheel wells from rocks etc, but that primer coat would never chip off. It was a hideous ugly yellow-green (which you painted over anyway) but I am her to tell you it worked. I don't know if the stuff is still available, probably the epa got rid of it like everything else that actually worked good.
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I believe zinc chromate is still available. Just check with your local auto or commercial paint supplier. Like Rod says the stuff is great for inhibiting rust. We used it extensively in ship repair as well as auto body.