Eddy wil probably be the best to answer that question and tell you if you need any kind of special paint. Mine has a few warmer places on it like in the corners but I can keep my hand on it anywhere over the entire cabinet. Of course the exhaust gets a bit warmer but before I vented mine I used to be able to put my hand on the exhaust pipe for 10 seconds while cooking at 225*F!
I know when I crank it wide open it is noticable warmer with the corners getting hot!
Peter