I used Rustoleum textured paint...bought it at Walmart. It's got a texture about like 200 grit sandpaper. I had it media blasted by a buddy of mine which is basically like sand blasting only i think he used either glass or plastic beads instead of sand...anyways it leaves it nice and smooth and super clean. I used some self etching primer and then about 4 coats of the Rustoleum, then sanded down the tops of the fins. I don't know how it's gonna hold up to heat yet but the paint is a huge PITA to sand off so it should do ok.