Unless you have a VERY good dust collector and respirator, DO NOT USE SAND. I'm talking real sand here, not purpose specific blasting media like coal slag, aluminum oxide or glass bead. Sand will cause lung damage...
I've used glass bead and aluminum oxide. Some folks swear by coal slag. Evidently it's pretty cheap as well. I think I pay about $30 for a 50# bag of glass bead and a tick more for sluminum oxide. I've heard coal slag can be had for about $9 for that same 50# bag.
Whatever works, use it. I prefer glass bead, but most of what I blast ends up being polished so I don't want the "rougher" finish the aluminum oxide leaves. It may be desireable for better bonding with PC tho.
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