I tried soldering 26 gauge copper wire to carbon steel using Harris Safety-Silv 45 and this Stay-Silv flux. The microtorch nearly vaporized the copper before it got hot enough to melt the solder and boil the flux. Stay-Brite low-grade solder with stay-clean liquid flux and a soldering iron worked better for me. Note: I'm a hobbyist, not a plumber or electrician. My working area is less than 1 cm2, so redundant. Update, three months later: it turned out that the plastic tub was leaking. It must have arrived with a slight tear in shipping as it has been in the same spot the entire time I have had it. The tub it comes in is made out of very thin plastic, similar to the kind you put dairy products like sour cream in. This material is corrosive and has damaged some of the items that used it. I would put this on a piece of dark paper to check for leaks upon arrival.
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