Review on 🔥 Rectorseal 14010 Nokorode Regular Paste Flux - Optimal Soldering Solution in a 4-Ounce Size by Daniel Anderson

I have been using this product to tin my soldering irons, pencils and tips for over 50 years. If the tip is hot, simply dip it in this flux and rub it in, then hit with solder to re-tin the tip. I've never used it to solder copper tubing, but I expect it will work just fine. I have several metal cans that are older than me and it's still the same product, just in a plastic container. The thing works great!