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Old 03-04-2011, 11:37 AM   #1
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Soldering Paste - Good or Bad ?


Someone recently told me that when soldering copper pipe it is best not to use Soldering Paste, but that it is better to use liquid acid (which I have never seen).

He says the reason is that the paste stays on the pipe and continues to work as an acid and corrodes the pipe.

Has anyone ever heard of this ?



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Old 03-04-2011, 12:53 PM   #2
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Never heard of that one, I would say if a joint is soldered correctly the act of sweating the joint would fill the void with solder.



When its all said and done there is usually more said than done
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Old 03-04-2011, 06:40 PM   #3
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Never heard that in my 30 years of doing this, also worked in many places that have copper installed for 50 + years and I can't say I have seen any holes corroded through the piping.
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Old 03-04-2011, 08:20 PM   #4
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A guy once tried to tell me that the ink from a magic marker would eat through copper. And another time a guy told me if you had eaten chicken with your hands the grease would not let you get a good solder joint. Now I have seen fittings that were corroded because the plumber failed to wipe his joints, but that is usually superficial, just a pet peeve of mine.
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Old 03-09-2011, 06:47 PM   #5
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ive heard that to, i use regular flux all the time, but like he said above, you wipe the joint clean with a rag. you should do that anyway just for appearence sake. i use old denim jeans as a rag. same with the body oils on your fingers, or dirt on your gloves, lol just dont touch the joint if possible.
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Old 03-09-2011, 08:59 PM   #6
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I always use a wet rag after soldering to wipe the joints.


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