It is always best when seam sealing a silnylon tarp or tent to have either of them pitched tightly. With the seams under tension and the needle holes stretched open and fibers moved the sealer can get into the areas where it is most needed.On silnylon, reinforcement is not usually needed. But this brings up an interesting side point. Seam sealing, usually done with a thinned silicone adhesive on silnylon, and often done new, is not as effective as *after* holes have already stretched open and fibers have moved, slightly.
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