I have a Craftsman bench grinder with buffing wheel on it. I have high polish compound I tried to see if this would be better or equal to using high grit sandpaper 7000 12000 etc. It has a mirror finish I think I would still want soap wash it make sure has all the compound is off. But what I cant find is what the compound would match with sandpaper grit. Any one use this method or am I wasting time with this and I should just use sandpaper?