I wonder if this would work for your application?
https://www.joann.com/artic-vinyl-54...k/3526274.html With the cold crack rating and UV testing, I think it might work. Years ago, I made some vinyl tire covers for an RV and it had a woven cloth backing. I think I also have some scraps that have a kind of thin batting backing, that I made a calculator cover with. It seems the calculator cover was a thinner vinyl than the tire covers.
Janey - Neat people never make the exciting discoveries I do.
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