Epoxy glues can be very very strong and have so far been very forgiving of my slap on and hope method of modelling:O)
Contact adhesives are a bit messy though are best for joining flexible items to solid, though some materials will resist it's stickiness.
Cyanos are good for tacking and smaller work, as well as thread locking but are brittle unless you try the rubberised type which is more potent.
