if its only going to cost £30 for pipe scrap all the old stuff, 15mins with a blowlamp will surely weaken the pipe, for a proper joint sparingly flux only the pipe then inset it into the fitting, heat for 9-10 seconds and you will see the solder starting to appear, that is all that is required, for extra comfort or due to lack of experience you can quickly touch your solder coil on the joint to add a tiny amount of solder, leave to cool and clean excess flux with a damp cloth, turn on and test, stand back and admire
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