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Just make sure you prep the surface properly. It won't stick at all to oil,grease,paint ....
Follow the directions, and it should be fine.
The bubbled POR-20 sounds weird to me. I know others here on the forum
have used it successfully on cast exhaust manifolds. Can headers get that
much hotter ?
EDIT
Pros : metal will be protected well from the elements
Cons: price, it may turn yellowish over time due to UV, letting it dry on your skin.
:seeya