[Tristan Lall]

I've seen a FIRST robot with its drive gearboxes held together by a similar product (it was titanium-filled, instead of steel-filled like J.B. Weld). It worked...but wasn't pretty.* I'd advise against that particular application.

When using it, watch out for the fact that it slumps as it dries, so it can be tricky to apply precisely to oddly-shaped surfaces. (I've also used a Devcon-brand aluminum-filled epoxy that is of a thicker consistency, which is more easily applied to complex shapes.) Also, though it's stronger than fibreglass resin, if you're using significant quantities of it as a structural reinforcement, it should itself be reinforced with something like a fibreglass mesh.

*The team was 919, Harbord C.I., in 2002.