I recently purchased a used tarptent contrail in good condition,except for the stuff sack. The sylnylon is coming apart on the stuff sack where the drawstring is in a couple of places. I have sewn a few things, but my preference would be to just tape this back together. I suspect that most tape adhesives will not stick very well to the silnylon though, so before I experiment with various types I thought I would ask the smart folks on here. Tape I already have includes cuben from zpacks, tyvek, and 3m (scotch) transparent duct tape from a MYOG tarp.
I did a bit of searching and found a thread from a few years ago, https://backpackinglight.com/forums/topic/62362/ , perhaps Permatex Flowable sealant could be a tape substitute, or at least provide a bit more something for sewing to hold onto? Or maybe there are other tapes on the market now.
thanks, Matt

