Heat gun or blow dryer?

Heat gun works best because of the concentration of heat. Like the guys mentioned, a hair dryer has a lot of air movement and not as much heat. I don't like the open flame from a lighter or hand held torch. The flame melts the heat shrink instead of just shrinking it.

That's where the common sense comes in.
If the lighter is held in place too long and melts your heatshrink, then don't hold the lighter there to long. :D

Sometimes I think some of you guys just want drag out as many tools, cords, lights and equipment as you can instead of getting the job done.

Go ahead and take 10 min to drag all your stuff out to shrink a tube if you want, and I'll be done with it in 30 seconds and be on to the next thing. :D

No wonder it takes some of you guys years to get a car on the road.