I have probably used a mile or two of shrink. Some has come in engineered "bills of material" in carefully wrapped "kits" and other was ordered from "Hos/digi/all/new/Jam" or "Bob's" electronics. None of them had a listing mark.
I do understand you never shrink a "wild hair" or pointy solder joint but I still wonder what a clean joint shrinked 30-40% is worth. Bear in mind the thickness of the finished insulation depends on the anount of tube you started with. A "close fit" is probably not a good thing.
