ORIGINAL: Bipe Flyer
From what I've read, JB Weld is the adhesive of choice for this application; I wonder how it would compare to the Polyurethane.
Something to consider. The epoxy is likely only in the area between the the wire and the tube whereas the ProBond may have expanded into the area behind the wire creating a hard plug that you were essentially trying to push the wire through. Would a pull test take as much force?
The ProBond did expand into the tubing -- my original intent was to make up a tube with one end epoxied and one with ProBond and pull on each end to see which failed first. However, there was a small amount of ProBond showing in the end of the open tube. Rather than try to clean it out and have the epoxy perhaps not hold as well, I made up another tube with epoxy. But, even if I can get 70 pounds of pull strength, I think that would be sufficient except for the largest model.
I will try another test with JB Weld and ProBond this weekend -- if I epoxy first and poly second, then I can try the pull test. Another adhesive that is supposed to be pretty good is the newer black or rubberized CA, but I don't have any to try.