We advertise on Interstate billboards and found this LARGE material is waterproof, very heavy and thick. I just received an email with a repurposing idea that might work well for some of you (especially in the winter).
Contact you local billboard company and you may be able to get this material free or here is a company that sells it:
https://www.repurposedmaterialsinc.c...lboard-vinyls/
Note: I do not have any affiliation with this company, so this is not a recommendation, just an option.
We live in Michigan, so I may do this next winter while stored in my driveway.
Some have used brass grommets, use will take a bit to install, but once done, it could be reused year after year easily.