I wish we had a Tractor Supply here. The closest one is about 2.5 hours away in Leesburg, VA.
I ended up taking your collective advice and I ordered 50 lbs of Aluminum Oxide from TP. I had them throw in a small parts basket while we were at it.
Yeah, I was using silica sand. I was using a respirator, too. But the dust was awful and I couldn't see. I'm going to clean the whole thing out, replace the window shield and start over. Maybe it will be fun to blast again...
Thanks for the advice!
John