I am an experienced artist, I work a lot with copper. I tried using this flux to solder a solid copper ring that I made to a piece of copper sheet. I couldn't get the solder to flow. I've experimented with other pieces of copper, used different gases and tips, trying to find the right temperature to make it work. Vain. He wiped the rubbish off the ring and copper sheet. Used a different flux with the same solder. Worked great. I cannot recommend this product.
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