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Contaminated Buff

If scratches develop on your cabochons after polishing with a felt buff, it is sometimes because the buff has gotten contaminated with grit, sometimes even one grain of grit will be the culprit. Take a soft block of wood, such as balsa wood, turn on the wheel, and while the buff revolves, hold the wood firmly against the buff.

The soft wood will pick up the offending grit. Then keep the buff covered with an old shower cap or plastic bag when not in use.

- Via The Stonecutter, Dusty Rocks 9/94