I have to agree with Stimpy c.
A good soldered joint will be stronger than any epoxy or other man made material.
I would also say that if you can find some "silver solder" like the stuff they sell at hardware stores it is even stronger than the lead-tin or tin based solders.
Clean the joints with a good degreaseing solution (like acetone or lacqure thinner).
Flux the surface well, assemble and clamp it so the joint is held tight and in the right position.
Heat the whole area gently until the solder melts when it touches the hot metal. (Don't melt the solder with the torch and don't overheat the metal. This is not one of the "more is better" things).
The solder should flow into the joint by itself. Use as much solder as it takes to completly fill the joint and let it cool to room temperature before you unclamp it.
Remove the excess solder with fine wet/dry sandpaper and repolish the area.
If the joint won't solder for you try a gunsmith.
If nothing works, then try the JBs but I suspect it will break again.