Well, not really a knot. I was wondering what the best method might be for keeping lines such as stay-set, stay-setX etc from fraying on the ends. I had assumed that I could just heat the end and melt it like any nylon line, but that doesn't work. The outer sheath will melt, but no the core. I have taped them, but of course the tape comes off after a while. I have noticed that a number of the sheets on my boat are beginning to fray, making it hard to run them through blocks etc. Any suggestions?