We don't have a media blasting business here in Vero Beach, FL so I decided to buy a compressor and a sandblaster and do it myself. I have not had any problem with warpage because I am using walnut shells combined with Black Magnum. Plus I am only blasting at 90psi. It is a messy, slow process. I created a "booth" by hanging plastic sheets from the side rails of my garage door and the back. roll em down and spray away (use a good mask!).