I normally don't do collision work and the few times I have replaced bumper covers they came primed. I have a Yang Tong after market raw bumper with no painting notes or even what material it is. How is the best way to prep this. I was thinking wash with tide powder detergent and a gray scotch pad. Wash with dawn. Wash with waterborne wax and grease and either epoxy prime or epoxy seal and paint? Do I need an adhesion promoter ? I have Bull Dog In a spray can. Please help me if you can. TIA.