Prepare to want to stab your eyeballs out watching/listening to this guy, but works on a cotton sheet, so can see why it wouldn't on canvas... might lose a bit of breathability though?
https://m.youtube.com/watch?v=z_R0gEDZhAI
(Highly recommend changing the playback speed to at least 1.5... it's very, very painful otherwise)
I need to redo my fly tarp at some point, so shout across the valley if you want to come check it out.
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