Vinyl Roof Replacement

You can use the POR 15, but I would shoot a coat of primer while the POR 15 is still tacky. As you said, it is to slick and the adhesive won't bite into it. I have installed a dozen vinyl tops this way and have had no issues.

Dido, except my POR15 was dry, I just used 400 over it real quick to scuff it and shot an epoxy primer on it.