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I would not use POR-15 on headers. If you drive the truck everyday, there really is no need to use header paint. The heat from the engine keeps the headers dry so rust doesn't have time to form. I drove the same truck with the same unpainted headers for 3 years and there was no more rust on the headers then there was 3 years earlier. But on a more seldom driven car, header paint/ ceramic coatings are a good idea.
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