Hello, JohnandDerek,
I have used coarse and med blasting sand from my local concrete dealer and did not care much for the sicla dust that came from it. I later found some at Northern Tool that was no scila that I liked better. It is called AmberBlast Abrasive Blasting Grit. It comes in a 50lb bag for like 10$. I think it did a good job in the 150lb blaster we used. I also have a small speed blaster that has a little tank on it I use for blasting small stuff. I blasted most of my cab with it and it worked good. It just took some time to keep reloading it.
