Ceramic coating the exhaust.

I am planning on having my entire exhaust ceramic coated. The Y-pipe, tuned pipe, U-turn and the muffler. All of them on the inside and out exept the muffler wich will be outside only.

Somebody I spoke to today says he didnt have good luck with his and it came off his tuned pipe. According to him its because the factory used cheap high carbon content steel that expands and contracts too much.
Is this just his own bad luck or is it true that it tends to come off the factory pipes?
My ceramic coater says no. Its fine. Just someone elses bad job.