I hang mine in my basement, with bricks holding down the guylines so that there is tension. Then I put the seamsealer on using a cheap foam brush. I use Permatex 81730 Flowable Silicone Windshield and Glass Sealer instead of the sealer that WB sends. I don't have to thin the Permatex at all, and it goes on well. I'm generous with how I apply it (in terms of the width around the seam), because my first effort, where I tried to just get the seams exactly, resulted in leaks. Then I do brush some baby powder over it before packing it away.
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