I have never media blasted any parts or a vehicle before so I have a question. The guy who is going to be media blasting my 1930 Brookville roadster to remove Brookville's lovely red oxide primer says he uses crushed glass. He strictly uses crushed glass on car bodies because supposedly the crushed glass has less friction which curbs warping issues & leaves a painter friendly finish. So I'm trying to get an idea if this is the right or wrong type of media to use? Thanks