VanVlack
Member Since: September 5, 2010
Country: United States
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The two things that would cause a problem with old solder would be the loss/degrade of flux and oxidization on the outside of the solder. Once you have the solder joint the flux has already been used and served it purpose of cleaning. Oxidization should only happen on the outside and not effect the connection of the joint already made. You may run into problems when working on older solder joints though, possibly contaminating the joint.
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