I'm sure you'll get lots of conflicting testimonials on what brand of paint to use. I don't have a big preference, but one thing I do is warm the intake to like a 150deg, paint it, then bake it at 250deg for about a 1/2hr or so, then turn off the oven and let it cool thoroughly before handling it.
One more suggestion, do it when the wife ( or girlfriend) is out of the house for a few hours. They get a little testy if they see it happening, LOL.
