Originally Posted by Peterpan1

That IS the flux I use so any problems are probably mostly heat control. The hotter your flame the easier it is to braze since the melting of the rod is a composite of the heat of the joint and the heat of the torch that happens to be in the area also, so even though you aren't melting the rod onto the joint like sealing wax, you sorta are... When the heat is cold you have to pump up the joint higher to get the solder to flow, and that is when the bad stuff happens.