glass bead is the way to go. It is shot at a lower pressure, and if the shop is good enough to have this material they know what they are doing. plastic medial blasting is good too.... but it doesn't get rid of rust. walnut and soda will not do much for body panels except take a lot more time in labor. Plus, when you get it back, you'll still have to DA the thing for the primer to stick... at least that's what my blaster guy tells me- it makes the metal too smooth. glass bead is just right and leaves a little profile for primer adhesion
