This stuff - http://www.justforcopper.com was shown to me today by a client who used it and was very impressed with it. I have never seen it before. Does anyone else know if its any good?
Nice!..“even works when pipes are wet.”
I’d be interested in hearing from users too. 
It may work fine, but it is probably not approved in your area.
Quoted from their web site.
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I’m not a plumber, but I ran across it in a hardware store when I was buying some copper fittings. I used it to do some repair on one of my rent houses. It worked great. I even had a pin hole at a minor kink in one of my copper pipes. It was a tight fit and I really didn’t want to have to cut that section out and redo it. So I figured I’d give it a try. I squeezed some on and rubbed it to try to get it into the hole. I then added a second coat a few minutes later. Six months later the pinhole and joints are holding as well as if they’d been soldered.