Prepping Poly or FG for vinyl

[Zerafian]

Got all the pieces of my body kit in and Im planning on getting the car wrapped.

I know I need to prep polyurethane and I think fiberglass in some way, before wrapping it, so that it sticks properly.

Iv taken random times in the past two weeks googling with no real luck finding an answer to my specific question.

My plan is to call the shop Ill be getting it wrapped at but until then I wanted to see if any one might know

thanks.