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      03-21-2012, 05:19 PM   #2
Derek8819
First Lieutenant
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Drives: 2015 F80 M3
Join Date: Nov 2011
Location: New Orleans, LA

iTrader: (4)

It's rust. The rotors are steel. I took my rotors off and cleaned it all off with steel wool then coated that area with high temp clear paint to prevent oxidation. Looks like new still after 6 months.
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