For a strong bonding on PVC plastic, two things are key: prepare the surface well and use the right primer. A primer is the common, reliable choice for spraying, even though some adhesives(like Molibon no-primer PVC structural adhesive) can bond paint directly.
Why is a primer usually needed?
A primer is typically necessary because PVC materials contain plasticizers, fillers, and various modifying additives. These features result in low surface energy and high chemical resistance. Witho...