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I am re-doing a pair of motorcycle mufflers that have some form of very hard, hi-temp factory coating that has lasted 18 years. Rather than strip them completely, I plan to rough the surface up (60-80 grit) and spray over it, since the original coating (whatever it is) has very strong adhesion. Here's my question: I am going to prime with the zinc XTC primer, then coat over that with XTC black, and then XTC clear over the black. Do I risk a too-thick coating that might peel or flake? Single coat of each, or is there the flexibility for 2 coats of each? Thank you very much.