In my experience, the best epoxy to use for fixing delams or for cementing ferrules for bamboo rod repairs is golf club maker's epoxy. You can buy it from Golfsmith or any golf club making supply source. It has very good shear strength, it's colorless and will not break down in cold weather. I've used it for many years without a failure. It is also very economical.

JB Weld is good stuff too but it sets up grey in color and doesn't have the long working time that golf club epoxy affords.

Hope that helps!
Regards and WDE!!!
Bob L.

" A clear conscience is usually a sign of a bad memory. "
--Robert Earl James