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There is a product called Rass o Nil. It is made for bare metal prep. It's a rust converter and bare steel prep. It covers the surface with a cloudy (dry) coating that prevents rust from forming. It also works like an ething compound to allow better paint adhesion. Only drawback is it cant be used with etching primer. Its compatable with all other primers. I have used it and its great. No sirface rust on bars metal over months
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