Sand/grind until bare
WARNING: This page is about a different car, the 2021 Porsche Macan, 2020 Porsche Macan, and 2019 Porsche Macan. However, it is still accessible from the selected car via links, so may be relevant.
To improve adhesion, sand the bonding surfaces until bare using 150 to 180 grain sandpaper. Use cross-sanding.
Only use abrasive products based on pure silicon carbide (SIC) for sanding/grinding down the bonding surface until bare.
 Courtesy of PORSCHE CARS NORTH AMERICA, INC.
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Sanding bonding surfaces until bare