I don't think Seamgrip is the right stuff for a Superfly. My understanding is that for a Silnylon tarp, you need to use a silicone sealer such as Silnet or Permatex flowable silicone. Seamgrip is designed for PU coated tarps. Superflys are not PU. In fact, on the Warbonnet website, he recommends a silicone sealer. Try a quick seal with silicone and I bet the leaks go away.
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