Okay, dumb question, but I have one of the PD trade-in 640's on the way and seems most have plenty of wear and blemishes. I have a spray paint air compressor for models. Would it be possible for me to find the right airgun and media and use that?
if your going to try this you need to get a piece of scrap metal like your working with. They sell about 3 or 4 grits of alum. oxide. You can change the way it looks by raising and lowering the air pressure and moving the eraser Closer and farther away from the work. It will work if you experiment with it. Just take your time.