Guys, I dont think he is talking about the pad surface area of the rotor, obviously this cannot be painted. I believe he is talking about the inner hub area of the router and possible the vented area on the outer rim of the rotor between the inner and outer contact area. This can be painted with heat paint Im just not sure how long it would last.

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2003 X5 3.0i
Premium & Sport package
Steel Gray Metallic
55K miles and counting