I bought some POR-15 exhaust manifold paint too and put it on some new manifolds(Thorntons) I got for the 403 Olds for my 79 TA. It may be a month or 2 until I run the engine with them. The exhaust heat will cure them.
I've used Eastwoods "stainless steel" exhaust coating for years and it worked pretty good. It was the brushable type that came in a pint or quart can, which I think holds up better than from a spray can. It'll be interesting to see if the POR product holds up even better.
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Steve F.
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