Not that I am aware of. What happens when it gets wet and burry or scratched. Hooded veils are hot enuf w/out the solar gain of plastic. But I'd probably give it a try if you built one.
I have removed scratches from clear plastic, but not from a face shield (it would be replaced). Some auto-body wet and dry papers are as fine as 2000 grit. Followed with a fine polish, scratches will be gone.Have you ever tried polishing scratches from a plastic shield? I get scratches on my glasses. My optomotrist doesn't try to polish them away.
Your title was about "visor"s? Did you mean visor or did you mean shield, like wind shield, something to look through? Just asking for clarification. Thanks.