Simple Ways to Use Soldering Flux (with Pictures) wikiHow
#0183;#32;Acid flux or tinning flux will remove larger areas of oxidization and give you a much stronger soldering job. Tinning flux has small amounts of a powdered metal alloy mixed into the paste. The powder will melt with the flux and help fill the inside of the pipe you are soldering, making it more waterproof and longerlasting.