I hired the job out. The guy came to my house with a rig on a trailer. He used glass media (don't remember the grit size, but it was pretty fine). I think he said he used 300 lb of it. As far as I can tell, nothing is warped. He was pretty careful about it. He took all day, including setup and cleanup, so it was worth the money I spent so I didn't have to do it myself. I would have had to rent a sandblast setup anyway.
