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HOW TO: Solder wires with FLUX and heat shrink. - YouTube
2.0mm Tin lead Solder Wire Rosin Core Soldering 2% Flux Reel Tube 60/40 on OnBuy
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The importance of the various available fluxes used in soldering - Learning Soldering for Electronics Video Tutorial | LinkedIn Learning, formerly Lynda.com
How much flux should I use in my solder wire? | Indium Corporation® | Indium Corporation Blogs | Rework | Solder Wire