Surface Pre-Treatment
WARNING: This page does not describe the selected car, but rather 18 other vehicles, including the 2015 BMW Alpina B7L xDrive, 2015 BMW Alpina B7 xDrive, 2015 BMW 750i xDrive, 2015 BMW 750Li xDrive, and 2015 BMW 740Li xDrive. However, it is still accessible from the selected car via links, so may be relevant.
Grind surface to a metallic bright-finish. The surface must be clean, dry and free from grease.
Clean the surface with a cleaning agent R1 and let it vent for 2-3 minutes.