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I buy 50lbs bags of black abrasive blasting sand from the local menards for like 5 or 10 bucks for doing blasting on my V8 Beetle http://www.v8beetleresource.com

I also have a fancy sand blaster:


















And a highly advanced abrasive collection system:






















But it does a great job, even with my 5hp 30 gallon air compressor. I just wire wheel as much of the rust and junk off before sand blaster so it isn't quite as slow going:



More pictures of this stuff at: http://www.v8beetleresource.com/chassis10.html

and

http://www.v8beetleresource.com/chassis13.html