I always carry a package of peel-and-stick nylon patching material and have used it with success on Goretex. You can get it at sewing stores (like the ubiquitous Joann Fabrics) or at most backpacking or outdoor supply vendors (Coghlan’s used to have packs of assorted colors). I recently found a transparent tape that I used on two of my folding kayaks’s coated nylon skins to make a base to adhere vinyl peel-and-stick auto decal type lettering onto them.
For adhering drysuit gaskets and repairing wetsuits and other neoprene gear, I use either Aquaseal alone or a combination of sewing machine stitching for strength and Aquaseal for sealing.
To give an example of how tough the peel and stick nylon can be, many years ago I went on an overnight canoeing trip with a couple who had an old wood framed canoe that had been thinly fiberglassed over the old painted canvas skin. They hit a rock and sustained a deep 3" long gouge in the bow end of the keel that leaked profusely. We pulled ashore and considered our resources for a temporary repair. Somebody had a pack of gum so one of us chewed up several sticks and we used the mass to plug up the hole. They I applied a patch of 3" by 6" peel-and-stick day-glo orange ripstop nylon over the gum and firmly smoothed the edges down. That patch not only kept the boat from leaking for the rest of the trip, despite some additional rock strikes and dragging it over gravel bars, but the canoe’s owner left that orange patch on for several more years of use and sold the canoe with it intact.