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[quote]QUOTE: Originally posted by bigg1666 <div align="left"></div id="left"> Wrong*** acid core should never be used on plumbing if it is copper. The Acid will etch the copper an eventually cause a leak in the joint. Some times this means tearing out dry wall to repair it or worse. I did copper sweating for over 25 years and was taught by professionals that had already learned the hard way from experience. Sorry to disagree with with one of the contributors (tebot41 [/quote] You may disagree as often as you wish! I don't expect to quit learning until they're shoveling dirt in my face. (I always thought the paste flux had a bit of acidic material in it.) I meant that acid core solder has no use known to me around the railroad. With rare exceptions, clean metal will "tin" with rosin core. tebo41, GM, B&FtN
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