I've been using this stuff for years. It's very handy for bonding metal or plastic together or for fabricating things with it. This isn't an epoxy like in the sense of a glue or adhesive, per se, although it can be used for that in the right applications. Basically it's a plastic-like putty that you can form and shape and then it hardens in a few minutes.Here's some examples of different ways that I've used it.I got a headlight for my bicycle but the mount was too big for my handlebars. That is, it was made to mount on a bigger diameter handlebar. So I used this putty to build up a ring about a quarter inch thick and an inch wide all the way around the spot on the handlebars where I wanted to put the headlight. Using water and my hands, I shaped and molded the putty so it was even and smooth all the way around, and trimmed the edges with a razor blade. Now the handlebar has this ring around it just the right size to fit the headlight mount.The plastic knob on one of the arms of my drill press broke off. It's an obsolete item that's hard to replace. So I just molded some of this putty into a ball about the same size as the original knob, stuck it on the arm, and let it harden. Presto, a functional replacement knob in about five minutes.I lost the cap for a tube of heat sink compound so I made one out of this putty. It screws on and off and seals just as good as the the original.Say you have a plastic thingy you want to attach to a metal plate without using screws or nuts and bolts. Gob some of this putty onto the metal plate and then press the plastic thingy firmly down onto it. Use a knife to trim away any excess before the putty hardens.Once this putty sets, 5 or 10 minutes depending on room temperature, etc., it's very hard and strong. You can't really machine it like metal or plastic, so you have to shape and mold it before it sets, but once set, it's durable. It's water proof and holds up against contact with various solvents. It also is electrically non-conductive - a paper thin section of it has >100 M.Ohms resistance according to my own bench tests.It's easy to clean up off of metal or plastic using water or isopropyl alcohol... BEFORE it hardens.It is rigid and brittle, so you don't want to use for something that flexes and bends or has to move in contact against something else. This brittleness does make it easier to remove later if you need to. You can use a hammer and a flat screwdriver to easily chisel and crack it off.A dremel wheel melts right through it like butter.After you mix the putty to a even and consistent gray color you have about 5 minutes or less to shape and mold it. Before it sets, you can use water or isopropyl alcohol to help smooth and round it, and as lubricant to keep it from sticking to whatever while you mold it into shape.around some surface.Before it sets you can wash it off your fingers with soap and water. After it sets use fingernail polish remover and a green scrubby pad!I wouldn't recommend using this putty for something that needs to pull a lot of weight... like a link in chain, or for a life-dependent application like sealing a leak in your oxygen dispenser tubing. But if you want to stick a bunch of aluminum cans and or plastic bottles together at odd angles to make art, or to fill in the broken off metal or plastic piece of some appliance, then this may be just the right stuff for you.