The gun is made for sand, actually, and I have used it a lot over the years for real quick small stuff and it works great. I have a larger pressure pot blaster also.
I also have a specific Schutz gun for undercoating, etc.
I know they say you need really dry air for soda blasting. I have a good wall mounted water trap but not an actual air drier. I would think that should be fine for doing these quick, small cleanup jobs where the air compressor isn't running for long periods.
Actually, right now here in Minnesota's Winter, the air is pretty damned dry to start with! (just ask my skin)
