my 8x10 tarp absorbed everything, so I spent some time squishing, rolling, and re rolling it up to ensure even coverage. It dried kind of blotchy, and after 24 hours, it was really dry. (it's been hot, with low humidity)
I took a hose to it, and sprayed it full-force. After a minute or so I checked, and not a drop of water was on the inside of the tarp.
This process added about 3-4 oz to the tarp, according to my scale.
If I had to do this again, I'd use some patterned (read: CAMO) fabric, as it did turn out blotchy. The rolled hem around the perimiter really darkened up, and you can see the trapped fabric edge now. -- not a big deal anyway...
John
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