It's 60/80 kiln-dried sand I buy in 50 lb bags from Florida Silica Sand. Pretty-fine, so it doesn't leave as-much of a texture as another more-coarse grade of sand.
http://fsscompany.com/catalog/dried-sand/6080-fine-blasting-sand/
It does a good job of removal, that's a 20 lb pressure can from Harbor Freight
http://www.harborfreight.com/20-lb-pressurized-abrasive-blaster-68994.html and for the small amount I do, it's OK. I suggest using a water trap on your air line, as it will help keep moisture from caking in the spray equipment's passages. I could shovel the sand up, sift it and re-use it to stretch its use, but I just buy a couple of bags, and sweep it into the yard when I'm done. That gets an engine done. I've painted w/cans in the past, I don't think there's any need to use a gun, I have several, but it's more trouble than it's worth. I suppose if I was going for an OEM look, I'd remove the side engine covers and spray them individually using a gum. I'm not going for that look.
Have any members done powdercoat on engine side covers? It seems that after a few months of riding, I just end up w/wear to the base metal on the clutch cover rear, especially. I don't know if powdercoat would be more-durable. Lastr time I sprayed, I used Seymour satin black in a spray can. It was pretty-durable and I was thinking this time I might try a semi-gloss.