I didn't know wind could tear poly. Mine has handled 80 mph winds without any damage. I'm in an open field and get 40-50mph gusts fairly regularly. It also held a few thousand pounds of snow after our recent blizzard.
I used diluted latex as shade paint last year, and thought that I would just pressure wash it off. Last month I tried it. It's the same power washer that I use to strip paint from siding and decking. They are dangerous to use, because if you spray yourself, it will split skin open like a knife. I thought for sure it would do the same thing to the poly.
But nothing happened. The paint doesn't come off, and even when I hold the washer nozzle an inch or two from the plastic, it does not do any damage at all. I would not have believed it if I had not seen it myself.
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