I've never had the need to sodablast and based on others' claims I prefer not to enter another possibility of failure into the equation. If it works for someone then that's great. This statement among others is a reason I do not do it, it was written by RamAirDave:
"Had one car soda blasted. Wouldn't consider it a 2nd time, and I don't know anyone that has.
Soda is a very soft media, needs a lot of psi, around 120 is what the local guy blasts at (he's looking to get out of it, go figure... ). There is a fine line. Some have been using it for many years and have it figured out. But too much psi and it embeds into the metal.
Try sticking a piece of masking tape to something that has been soda blasted. After you pick the piece of tape off of the floor, realize that there is an adhesion issue that you have to address. There are washes/solutions to clean it (tried them), but you better get EVERY SINGLE NOOK, EVERY SINGLE CRANNY. Three times.
Sure, you get clean, smooth metal, but it creates another issue that sets you back. I've heard the sales pitch years ago and I bought into it. I now know better.
With other media, if you don't get 100% of the media out, you get trash in the paint. Sucks, of course. But with soda, if you don't, you have paint chips/flakes on the ground.
And if there are issues down the road after the car is painted, some paint mfgs won't stand behind/warranty a qualified painter if they know the car was soda'd."