Paint exhaust manifolds?

I like the brush on stuff sold by eastwood. make sure you "cure" them I usually put them on my wood burner in the garage and warm them up to cure the paint.
some guys use the oven ( don't let your wife find out ) and make sure the windows are open. have done quite a few sets this way. they hold up pretty well.
I have heard of guys starting the car running it for a few minutes, letting it cool and repeating it a couple times to cure them.