I've used glues, cements, and adhesives professionally man and boy for over forty five years. Boatbuilder, you see. My experience is glueline failure is 99% operator error. Usually from not reading and using the manufacturer's instructions.
[size=150]READ AND FOLLOW THE BLOODY INSTRUCTIONS ! ! ![/size] It'll give ya sump'n to do on the way out to the garbage can.
Most of the time the manufacturer actually has some hint of an idea as to what is required.
I know, I know, that's just crazy talk, sorry.
Three Hawks