This is some fantastic stuff. You can weld two pieces of copper together without heat, flame, solder, fireproof rags, and such. Sand both pieces with the sandpaper, apply the liquid, it doesn't a whole lot but some, then put them together and twist 360 within 5 secs and it's done. No leaks. It is a solid weld. I've used it in the past and it works miracles in tight spaces where u can't use flame. If you do it a few times, you will get quick and easy at it. A time saver. It's some good stuff.