Hi there!
I just put some 3M DI-Noc film on some of my 986 interior parts and it worked extremely well on the parts that were already painted one year ago but not so well on the unpainted stock parts.
Maybe someone made similar experiences? I tried it with a special 3M primer but it didnīt work. So I guess the only solution is to sand and paint the parts, wait a few days and then apply the film.
Here is one example (door handle cover):
Greetings from germany!
Chris