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A: I had the same problem. I tried different flux and mine worked better too.
A: This is very difficult to answer not knowing what prep was done etc. It is very important to clean the pipe prior to applying flux or heat. I have used many different types of flux with good results, but the main thing was to always clean the pipe first. I suspect that the first flux you used cleaned the pipe well enough for the second flux to do its job...Hope this helps.
A: Dear Leo, to answer your question, the solder itself is defective, just a bad product.
A: 1st, did you clean the joints? Did you apply to much flux? Did you adequately heat the joint prior to applying solder?' All of these items can effect the quality of the soldering job. Grease from your hands can affect the joint. Always clean the joint, use flux sparing and ensure the joint is heated to a point where the solder liquefies upon touch to the joint.
A: it worked fine on my pipes. If you don't clean the pipe first, get enough flux on the pipe or get it hot enough then it wont stick.