I've used the same silver tarp for about 3 years now, maybe more, and it'll go at least that many more, I expect. Granted, it's under a large Maple, not in full sun, but it's stood some pretty stiff breezes, like the 60 mph breeze we had last week; not the 1st sign of a tear. It's what's left of one of those hoop style, tarp-covered shelters that the wind took down several years ago.
I'm building another hoop coop, will be used as a greenhouse. I'll roof it with the poly panels you referenced. How did you fasten them down to the livestock panels? I'm thinking hd zip ties.
Notice a lot of people using zip ties and can't help but wonder if the sun ever shines on them. I quit using zip ties outside for anything other than temporary emergency. The sunshine in my area destroys zip ties in about six months. I tie wirh galvanized wire now.