I currently have a SA Black Stainless that the finish is worn badly on. I talked to Springfield and they want $175 to refinish the gun. Instead of refinishing it black I started to sand off the black finish and was going to bead blast the gun. Do I have to sand off all of the finish, or will the bead blasting take care of it for me? Also, there are a couple of scratches on the gun that I would like smoothed out. Do I need to sand those smooth or will the beads take care of that also? Thanks.