i washed... with soap and a SOS type pad... got all the dirt off then just sprayed away... i figure the texture of the powdercoat would be grippy enough to allow the Dupli-color to stick... appears fine so far... i even did a unscientific test and tried to rub the paint off with my hand... i dont realy put anything up on my rack so thats about all the testing i need to worry about

---edited cause stormy is a smart ass ---