3.1 Preparation of the surface on the vehicle (series status)

WARNING: This page is about a different car, the 2013 BMW 550i GT, 2012 BMW 550i GT, 2011 BMW 550i GT, and 2010 BMW 550i GT. 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 the series 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.