Honestly, Mine is done with $12 cans of touch up spray paint from super cheap. Its been 6 months and it still looks like this:
No its not as good as ceramic coating or any of that, but its stood up to the heat fine. Its not even prepped that well cause it has scratched off in one or two spots, but the heat is not a concern. I have 2 spare sets of cam covers to do it properly later on, but I'm pretty happy with how well these have lasted so far