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8. With the sanding done, Gary used several grits of polishing compounds and buffing wheels on a Baldor buffer to create the final finish. The metal compounds come in a block-like mold in several colors, each representing a different level of polishing. The first compound is a gritty aluminum oxide, the two middle ones are made of chromium oxide, and the last is a white compound of a non-gritty aluminum oxide. Be sure to use a different wheel for each compound; mixing compounds on the same wheel can lead to a dull finish.