After a night of constant rain I was surprised to find water in the generous 1" / 25mm hems at the bottom of a Clark rain fly / tarp. No leak at the ridge line and no wet anywhere else I didn't want it.
Do you seam seal the stitching on hems, or just remember before you pack up to squeegy between your fingers all water that collects in them? I can see failure to be complete in the sealing as a moisture-trapping problem.
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