I wanted it to be a nice privacy fence to sit on the elevated concrete around the Pool.
So I built a painted Cedar fence with FRP for the insert panels.

No paint or anything, just raw FRP openly exposed, both sides to 20 years of North Eastern Winters, Summers, radical Temp changes, rain, sun, Chlorine etc.
And that's a School yard out back, balls hitting it, all the kids, and all things associated with a School Yard.
All the things I'm hearing that FRP is not supposed to do.
I recently had to reinsert a panel that was knocked out of its slot by something from the School Yard. Something that is a regular chore.
The panel was not broken, chipped, brittle or chalky.
In fact it looked as good as the day I put it in some 20 years before.
This is one hell of a test for a material that's not supposed to be able to withstand the Sun, Temp Changes and so on.
I'm convinced that this stuff can be used outside on say....A Trailer Roof that needs a solid nonporous sheet material.
Just my experience with the stuff.
Happy Trails
Len