Preparation Of Surface On Vehicle

WARNING: This page does not describe the selected car, but rather 21 other vehicles, including the 2013 BMW 328xi, 2013 BMW 328i, 2012 BMW 328xi, 2012 BMW 328i, and 2011 BMW 328xi. However, it is still accessible from the selected car via links, so may be relevant.

Establish a level bonding surface (e.g. grinding). Do not remove primer entirely.
Do not grind/sand bonding surfaces.
If necessary, pre-clean bonding surfaces with cavity sealing wax remover.
Clean bonding surfaces with cleaning agent R1.
Allow cleaned surfaces to dry for approx. 5 minutes.
Bonding surfaces must be completely dry.