Quote:
Originally posted by OkieRon
Can you use Por 15 over the top of the coating over metal (like the underbody coating) that came from the factory. What other places are there that are absolute rust worries that could use a coat of POR-15 I might miss.
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You can, but you'll get no benefit out of it, like others have said, its got to be directly on the metal. When I bought my car the better part of two days was spent by myself and two helpers removing all the underbody coating on my car down to absolutely bare metal, etched with Metal Ready and POR15'd.