Hi Dave33, What product of JB Weld did you use? I am not sure which one would be best suited? Cheers
Any "Filler" type epoxy. These are highly viscous (so that they stay in place while curing) compounds used to fill in gaps or large holes. They are typically in the opaque gray color range, and have a 24hr cure time. Any number of epoxies sold at the hardware store will work, they are all generally called "JB Weld" because JBW was simply one of the first.
Your biggest issue is going to be adhesion, and this is because a great many plastic molders use a silicone-based mold release. Nothing sticks to a surface treated with silicone, so you might actually end up taking a pocket knife and trimming off the exterior surface. That's not a bad idea anyway, since the epoxy will grip a
rough surface better than a smooth one. One last bit... if you need to build a dam to guide the epoxy, I've found that regular Scotch tape does great.