Saw this on a web site somewhere, but havenít seen it here. Use a Radio Shack electricianís 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, donít buy the cheapest. Thatís why I thought to make this post. My last iron died.