sand balsting questions I had, I was taking to a few people and teh mentiond that some blasters are to powerfull for my type of tin unibody and the blaster can warp or "wave" my my body???

Any one have more info on sandbalsting, what about soda blasting? will it beable to take off the under coating? what is bead blasting? any other methods aside from acid and crap?

Also I was wondering are there places that rent out the stuff so I can do it my self? or is it like a on site only type of deal? I know nothing... But I am a very DIY type of person