ComStar Copper Lock, No Heat Solder for Copper & Brass Pipes, Instant Leak-Proof Seal Up to 500 PSI, Handles All Refrigerants, Withstands -60°F to 300°F,10 ml Bonding Solution for HVAC (10-801)

Telling you what as in for not leaking and Fast clean hold.. This stuff is amazing .. bending the pipe back and forth under pressure yeah it will break but any mechanic and plumber knows compare it too locktight if you twist it enough or bend it it will break loose but a copper pipe in the wall or for a fix its as good as solder its amazing actually i never believed it would work... for the price and the big bottle you can do allot allot of pipe repairs for allot less money for solder and Map gas so a better value for the money for sure

My copper pipes split apart at the weld during the winter and this product was a lifesaver. It actually worked . I tried different products including plumbers putty . This saved me from having to call a plumber in the middle of winter on the weekend and It’s still holding.

This soldering liquid is the boss! My basement lock off started leaking and I had to change the whole thing to a more modern valve, the piping is copper, instead of buying soldering equipment I got this for a fraction of the cost, and it is superior in performance,saving time, money, and above them both, no risk of burning anything.

I used this product to install a baseboard radiator with 3/4" copper pipe and followed the instructions. It worked perfectly! I used a copper pipe cutter and 80 grit sanding cloth for the pipes. The product is a bit runny, which was actually helpful for connecting to a pipe inside the wall. I used SharkBite caps to seal the ends and pressure test the system for leaks before installing drywall. I was thrilled to avoid soldering the pipes. I’ll update you on its performance after the heating season.P.S. If you need to disassemble the joints, have two grip lock pliers ready to turn the pipe and break the seal. You’ll need to re-sand the pipes and start again.I hope this review helps!

This stuff does not work for home water plumbing. If you buy it you'll find that out. You've been warned.

Great glue for copper use, joining sections of copper pipe. Holds under water for a fountain pump but not sure the strength for interior wall water plumbing pressure?

Had very good luck using this for capping off a copper pipe, also worked on couplers just remember if you have even the slightest bit of water touch this stuff game over as it “will” leak although with a little heat the fittings come right off. The best thing about this for me was using it to glue a chrome plated copper drain line to the inside of the main copper line, as those who know the chrome plated copper is slightly smaller in diameter than the inside diameter of the standard copper pipe, once all of the connections are made I simply drip copper lock in the small gap between the two pipes, tried it first with 2 scrap pieces to make sure it works as I do not want sewer vent gasses coming into the house, honey what’s that smell!

I used this to solder an outside faucet. One of the pipes connected to the faucet came apart at the solder due to the freezing weather. I did as the instructions said by sanding the pipe and connector. Next, I put the liquid solder inside the connector and on the pipe. I then gently tapped them together. I waited over an hour before turning the water and over a day before allow full pressure. To my amazement, they so far have held together. I did add a little more of the liquid solder than was recommended.