Yes, I used the Polyfiber system completely. Some was finished in Polytone and some with Aerothane (urethane). You can download the PolyFiber manual for free, but I don't remember the website. It is an easy system to use. The downside is that it uses highly toxic stuff in every product, the Aerothane or any urethane is bad stuff. It is doable, but you need to use the proper PPE.

The only thing I wasn't super happy with was the lack of pigment in the Aerothane. It takes a bunch of coats. With my red color going on top of white I ended up with a lot of mismatched panels.