You might want to try Cerakote. Originally conceived as a firearms coating, it differs from powder coating in that it’s an air dry coating, so it’s safe to use with rubber seals, gaskets, plastic, bondo, etc. The temp rating is up to 1800 degrees. Areas where you don’t want the coating can just be masked off with normal painter’s tape. Engine builders use it to coat pistons. I did my fully assembled ZF trans. They have metallics and clears too.
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