Holy crap Rob, that's balls!
You can also cheat by taking a torch to the headers and warming them up a bit and then slapping some paint on them. Just float the heat over the paint for a second or to and voila, ghetto baked on finish.
I got away from doing the 1500 deg stuff and just used regular spray after awhile. The results were the same: would turn chalky after awhile or peel and have to do it all over again.