[Arlen]

Just got one back last week that was garnet blasted. I had never heard of using the garnet before but was very pleased with it and it wasn't a whole lot more money than sand. I've also used soda before and while its gentle on the metal, doesn't seem to have good results against old bondo. I will cast my vote as using sand as least desirable. Even if he doesn't hurt the metal, it is a real chore to get all the sand out of the body. My favorite is chemical dipping.