Body Shop/work info and advice!!!!

I have a body kit that is made out of PFRP (Poly Fiber Reinforced Plastic) basically fiberglass with plastic properties for durability and a fiberglass rear wing. I'm looking to find a way to help prevent spider cracks and increase the durability of the kit and the wing. Someone said that I could probably get a shop to use a single-stage urethane to do that. My questions are:

Is that a good idea and does it work?

How much should it cost to do a Front Bumper, Side Skirts, Rear Bumper, and Wing?

What questions should I ask of the shop when I'm trying to find a good one to take my car to?


Thank you for all your help, but please only answer or comment if you work for a body shop or own one! Thanks again.