This looks interesting, seems to tick a few boxes. However I wonder how it would go on silnylon.
Here's a description
"Rescue Tape is extruded of high performance silicone elastomer. It is self-fusing, and cures at room temperature. Its high thermal conductivity allows rapid heat dissipation, resulting in lower temperature rise.
Rescue Tape is suitable for use wherever a tough, high temperature (to 260O C), permanently resilient insulation or seal is required. Properly installed, Rescue Tape provides a moisture-free permanent seal around hoses, fittings, tubes and wire harness bundles, offering low cost solutions to common problems in extreme environments."