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Remember, your pipes have to be completely empty in order to heat up your jontis for soldering. If there is any water (in the pipe) in the area you want to solder, you will be there all day with the tourch and you will destroy the copper you are trying to seal. TOO MUCH heat is not good. Just like in the video, the solder will get sucked up and form a good seal. See the Trick below, if you cannot empty the pipe of all water. It works for me.