Do you mean ceramic coating? Its similar to powder coating or painting. First the part is sandblasted with 100g silica. Then coating is painted on and baked at high tempature. Then the part goes into the media vibrator. When they can't put the part ino the vibrator, then they use very fine steel wool to polish the part, but it doesn't look as nice. When my headers come out they almost look like chrome.
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james
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