Why do you guys use glass instead of sand?
Because I am limitied with space...I buy the play sand from Repot Depot and sift it; because it has some larger pieces of sand that stop up the gun. Then I just go outside and blast all my parts and the sand goes into the grass/yard. I wear googles and a mask. I hang a bucket of sand in the tree, gravity feeding the line going down to the hopper on the gun. I modified this gun:
http://www.harborfreight.com/21-oz-h...gun-95793.html
Drilled out the hole from the hopper to the gun at max size, I think it was 1/4". Have a 6 HP air compressor.
Finally, I set up a high volume fan behind me to blow the sand, dust and mosquitos off me.
Pepe