Vibra-Tite

0.5ml packet and 5ml tube of vibratite VC-3 threadlocker.  Just a small amount per screw will do, but don't even think of mounting bindings without it.  The last thing you want is to lose a screw on the hill, or worse yet, loose a binding.  Apply to screw threads and let it dry, it will last for about 10 swaps without need to reapply.  This formulation doesn't effect the plastic parts on bindings the way loctite does.