Sandblasting

if you want a fine material ,Black Beauty comes in 2 or 3 grades, most sales people at home depot and some of the big stores don't know the difference , Black beauty with red lettering is a fine grade goes thru my small 40 lb blaster ok, the Black beauty with black lettering on the bag is course, no matter how big of tip i put on my blaster ,i can't get it to flow, it clogs my blaster . i think the fine is listed at 80-100 grit and the course i think is 20-40 grit. its really coal slag and not nearly as dangerous to your lungs as sand, you can get a hood with vents in the back if you don't have a cabinet, with sand it causes cyst in your lungs, you need a respirator , i buy it at tractor supply for $7 for 50 lbs., if you strain it thru a screen ,you can reuse it 3 or 4 times.