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Originally Posted by signalredcoupe
It's made to go over rust, so don't grind the rust down to shiny metal, leave some for the POR-15 to stick to.
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Question: My passenger floor pan is rusted through on my '79 Chevy PU. Floor is very rusty, and a couple of holes. Are yall saying the POR15 actually is just painted on over the rust? Does this stop the further "spread" of the rust already formed?