Wow, quite the project!
I've actually been wondering about all of this after my tarp got quite a bit of exposure in Florida. I lived in/under it for about 5 months, and although it was in a shaded pine forest it still got a decent bit of direct afternoon sun. It will be interesting to see which waterproof material should last longer if there were no catastrophic failures in the tarp itself.
Thank you for posting this Brian!
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