Needs to cure hard. And no shrinkage.
a) What are you Bonding? (just the Materials - don't need to 'break OPSEC' about yer Project..
asking, as..
b)
Depending on the Materials to-be Bonded.. the "Best Non-Shrinking NASA-Level Bond" will be via one of the 'UV-Cure Epoxy's..
I used to use some of that stuff for building Optical sub-assemblies (in a 'Clean Room', under a stereo-microscope) for Laser-systems, where the Parts had to not only 'last' - thru Impact / Vibration / Heat/Cold - whatever - but to NOT 'shrink', down to tolerances of keeping a Laser-diode's beam focused in a particular-point thru a Crystal -
to a couple "nm"s (that's
Nano-meters And That stuff
Did it.
Yah, it's 'NASA-grade' alright..
..That's Also a reason it's the Top Choice for restorative Dental work - Keeping Porcelain / Zirconium, etc Crowns / Veneers, etc, in-place - thru heat / cold /
Extreme Pressure from biting / chewing, etc...
impacts from Errant Forks etc.. - and
For Years, so..
Let me know more about yer 'Materials to Bond', and I'll check my sources / see if there's a Good match..
PS - Good 'Pro-grade Adhesives' resource for some Research:
https://www.gluespec.com/
jd