I have a Milwaukee heat gun and used it fine on my LT-40. Trick is to back off a little and keep the gun moving. I used it on the cooler setting. Worked fine. Work with some good light so you can better see the covering shrink(reflection).

Ultra coat has a bit of a very light texture to it before it's shrunk. It is very apparent when that texture goes away when that area shrinks.

Good luck.