I'm having a steel frame (EAI Bareknuckle) powder coated and have a couple of shops who can do it. One of the main differences between the two are the blast media used to strip/clean the frame. One place uses aluminum oxide, while another uses sand. Would one of these be significantly better than the other for my situation? I know steel is stronger than an aluminum frame, but I'd still like to avoid removing too much steel, especially since I know the frame has been powder coated once before.