I thought I had found a great way to sandblast. There are mobile companies that used crushed glass and water to blast and they do it at your home or shop. They said they couldn't warp the panels even if they tried. They were DEAD WRONG! Besides, you will be cleaning up the parts for months to get all the media out of your tub and parts. Take your parts to a proven and reputable company. It will be worth it, I promise. It took many hours to straighten two warped body panels.