I solder crappy scrap wire, Teflon FEP and other silver coated wires. I've also tried not using flux at all and I can safely say that without this flux the solder will not stick easily, if at all (to cutting wire). The amount they are selling is ridiculous and will take way longer than what I paid. The only thing not to do is apply too much flux, honestly it's not a problem but I don't like seeing the black residue it can leave. Five stars!
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