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The wheel hangs from a grounding hook ready for its application of powder. The Koseis, like many cast wheels, wear a protective clear coating, which Andrews had chemically stripped. The process also etches the aluminum surface to provide a better adhesion for the powder/pigment medium. After chemical etching, the wheels are sandblasted to remove surface irregularities and pre-baked in the oven to relieve the cast-aluminum of trapped gases. View Related Article
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