Carefeul on using the MAPP in a butane/propane torch. I did and the regulator diaphragm eroded to the point where I had flames coming out from under the regulator knob! This was a hand held model that screwed onto the propane bottle. I chucked it into the backyard corner and quickly hit it with a hose and let it leak out. Anyone have any success with Muggyweld? I bought a few sticks for 8 bucks at a home show. Demo guy was a pro for sure as I could never get it to stick to what I was welding! It always balled up no matter what temp I had the material at.