I talked with the DuPont automotive paint guy about this last week. He said that flat black does not get as hot as normal gloss automotive black. Don't know why, but that's what he said. We got to talking about it after I saw Chuck's car that has the portion of the door inside the window painted flat black. I may do this on a couple of spots on mine, but since the green I am looking at is fairly dark metallic, I haven't decided yet.