Many people lease their cars so plastidipping is a prefectly reasonable alternative to painting when you have to have it back to stock in less than 3yrs. I'm not sure how calipers are any different than wheels in this respect.
Wheels = perfectly fine
Calipers = crazy?
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2014 CC R-Line DSG | 2010 S4 Sold | 2010 BMW 135i Retired | 2006 Lotus Exige Sold