I've been looking at all of the nice work all of you folks do and I was just wondering why you guys don't use a heat absorbing gel or clay to localize the heat when brazing or welding.
You could weld/repair a dropout next to a brazed joint and not have to worry about it coming loose for example.
Just not needed? Never heard of it? I use it all the time in the automotive machining world.
There are gels that work so well,you can hold a wrench in your hand,run a 1/2" bead of gel around it and heat the end of the wrench white hot.