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A few points:
Commercial soda goes by the trade name Armex, marketed by Church and Dwight, the Arm & Hammer people. They will claim that you are infringing their process patent if you use anyone else's soda in their Armex blaster machine, a modified sandblaster with a couple of pneumatic vibrators to keep the soda moving.
Water is injected into the process for dust control, not for coolant.
A bare steel item can be left for weeks before rusting. I have personally done this. However, you should use typical anticorrosion methods after you blast anything.
One last item-- typically large diesel-powered compressors are used, like a Sullair 180, to generate the CFM necessary to properly blast. I have never tried soda with a home setup, I can imagine it would be ok but not spectacular. With the big compressor, soda is spectacular. How about stripping paint off a panel while doing no damage to installed chrome trim or glass? Done that.
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