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post #2 of (permalink) Old 11-29-2012, 06:43 AM
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Join Date: Jan 2012
Location: Oakland, CA
Posts: 2,318
A pretty common substrate is the coal slag blasting grit. usually something like 'black diamond', 'black beauty', 'black blast' or whatever. seems to work pretty well if you can find it at a supplier near you.

I don't know the grit sizes off hand, but I'm sure folks will drop in and let you know what works for them.
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