My tarp is a DIY 12x10 made of 1.1 oz nylon fabric that I waterproofed with about 6 cans of spray waterproofing. and then used seem seal on the center (ridgeline) seam. I was laying under it a couple of days ago with my son set up a couple of trees over. A pop up shower started, and in a few minutes I noticed a very fine mist under my tarp. It got so bad that I could not see out of my glasses and my son noticed it and commented on it. It was like the rain was being forced through the fabric under very high pressure?
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