Cliff; As far as the bumpers, I use a product called "bumper black", I believe it's made by McGuire's or Mothers. The trim I use a spray paint called Black Satin. Not much different from Krylon truthfully. The louvres I had more of a problem with, as the heat from the engine and the sun would constantly keep bleaching them gray. So I used black grill spray paint, it keeps it's color up to 1000 degrees. So far, so good. Scott