Does Your Hot Solder Drool and Cover Your Copper Wires Like Hot Butter?

Not mine. Ever try to put alike poles together on a magnet (positive to positive or negative to negative) and notice how they repel each other? That is my lifetime experience trying to solder a new copper wire to an OEM wire on a classic vehicle. Don't matter how short I cut the wire down to, how much flux I apply, or how I twist the wires together (or don't), or what type of solder I employ.

I watch those youtube videos where the solder just melts and covers both wires instantaneously and I get so envious I almost begin to drool.

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Might just not be enough heat. Possibly iron too small or tip not on tight. I prefer a gun. To join two wires, I slide heat shrink on one side first. flare the strands a bit and clean with scotch bright. Apply flux and twist together. Heat the wire and feed the solder to the wire, not the tip. let solder cool on its own before sliding shrink tube over and finishing it.