The shrink wrap works great. I messed up a few pieces in my learning process. When you apply it you cannot have your propane torch 'barely on'. It needs to be full blast or rather pretty high. If the torch is not high enough you will soot up everything and you won't get a good shrink.

I probably could get away with going one size smaller for the shrink tube (I was going to do just that but it wasn't available at the time). Regardless if the shrink wrap doesn't stick totally to the bare wire like glue, but it definitely does what I got it for, which is to keep the heat sheathing from fraying and unraveling. It's pretty tight on the bare wire but if you try to slide it up and down the bare wire you can move it. Hardly anything worth worrying about, especially for my use.