I use the blue on the screws only,a drop on each,get the crosshairs perfectly alighned and the relief where you want, then tighten them down snug.I do this on the ring screws and the receiver screws.One thing though, dont loctite the screws if they are steel and the material they go in is aluminum or some kinda lightweight aluminum/steel alloy(or vice versa).Steel on steel, I have no problem.aluminum is not a good material to use loctite on.itll hold fine until you try removing the screws.it has a tendancy to take threads with it,especially fine threads.lol.
and resist the urge to pick up the gun for 24 hours while the loctite is getting hard.