Quote Originally Posted by Nut View Post
Hadn't thought of that. But don't most plastic blocks UV?

I already have the closed plates and the fences.
These smoke colored poly sheets may have the anti-UV layer added as a special coating for better weather resistance. I'm not sure about that. That would be a good question for the manufacturer. But it would be another plus if it did block the harmful UV rays and just let visible light pass through.