Soldering iron.

Saw this on a web site somewhere, but haven’t seen it here. Use a Radio Shack electrician’s soldering iron, for sealing the fray on rip stop nylon, polypro rope, polyester rope, and other nylons. Better than matches and blow torches.

Use the sides, not the point of the iron. And, don’t buy the cheapest. That’s why I thought to make this post. My last iron died.