J-B Weld 8265-S Cold Weld
The J-B Weld 8265S Weld Compound - Epoxy Twin Pack is the best metal glue available because for one, it’s waterproof. In addition to that, once the bond is cured it’s petroleum, chemical and acid resistant. That makes it a great adhesive for outdoor and garage applications. Furthermore, once the glue is dry it can be drilled, tapped, machined, filed, sanded or painted. This also makes it a great adhesive to consider if you wish to work on metal that has an aesthetic value. I also love that after the glue is set, it’s non-toxic. That makes it safer to use. My final reason for listing this glue as the top is that it has a tensile strength (the stress that something can withstand while being pulled before breaking) of 3960 pounds per square inch. That’s huge and it ensures your bond will more than likely never break.