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Here's the specs on black beauty. Black Beauty® Abrasive (Boiler slag, Coal slag) from READE Black beauty has very low dust, but I used sand because it was 40.00/ton in 50 lb bags direct from the quarry.

I used that size compressor with a 300lb sand pot and blaster with a 3/8" nozzle. Took most of the day and about a ton of sand. Multiple layers of CARC are tough.