Handling Primer: General
WARNING: This page is about a different car, the 2018 Porsche Macan. However, it is still accessible from the selected car via links, so may be relevant.
Primers improve the long-term durability of the bonded area
Primers reveal the actual condition of the surface to be bonded.
Primers protect the bonding surface from environmental influences, thereby increasing corrosion protection.
To achieve a better effect, apply primer only very lightly.
Primer prevents oxidation of the surface. This is particularly important when bonding aluminum.