i have used a propane torch, but it concentrates to a smallpoint, as you know. but it takes so long to move it up and down the limb, it never seems to heat evenly. it can work, but i just use an open fire outside or in the fireplace if it fits. a heat gun is probably best, but i dont like using any kind of electric on my bow projects, i dont even likie using the torch but i did it a time or 2 b\c i was curious..lol- Ryan