with powder coat you can not use body filler or any other type of filler to fill pits. Won't stand up to the 400 degrees in the oven. I just ground down, filled with weld and sanded the bumpers for my wife's 55 Pontiac. They go to the powder coat guy next week. I'm using Prismatic Powders super chrome. All the bumper parts will take about 4lbs of powder. With shipping $95. The cost for the sand blasting, application and baking, and a clear coat on top so two bakings is $400. I couldn't send it down to get it chromed and returned for that. + the bumpers needed a lot of work. Took me 6 days of 6 to 7 hours each to repair.