I heat cycled it similarly to your use. The issue is the salty roads. That was the whole reason I got it ceramic coated... I was less than impressed. I already contacted them with no response, BTW. It wasn't all that visible from the engine bay so I never pursued it further.
Car is sold anyway
oh, here's the pic I sent to JDL...
anyway, didn't mean to poop all over your thread, but it was relevant to the question.