In order to polish any material you have to use the
process of lapping. This consists of continuously rubbing with a progressively
fine abrasive, and the process applies to wood, metals, and stone.
Silicone carbide is the main type of abrasive used to
polish concrete and is commercially available with a magnesite or resin
bond in all the shapes required. The final buffing is accomplished with
either oxalic acid for calcium carbonate or one of the superfine buffing
compounds for harder stones.
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