Re: Loctite scope base screws (blue | red | nothing )
I have used all, blue, red and nothing, at all. I used to think things were permanent, never change bases or rings. Wrong. I find that I change rings fairly frequently, and bases once in a while. I have snapped the heads off of the hardened base screws. A couple times, half of the head. The blue sealant is a step in the right direction, if you promise never to change your configurations. (big objective, small objective, etc.) Blue seems to hold fine.
Okay, that was before. Now, I am careful to completely degrease the threaded holes, chase them, and really make sure that all the crud is off the screw threads....and use nothing when mounting; bare metal to metal. If you use a little gun oil, once in a while, rust shouldn't be much of a problem. I see nothing wrong in applying a small drop of nail polish to the underside of ring screws, as you would trigger adjustments.
One thing for sure, I do not feel that the red Loctite is appropriate on a firearm.
(subject to changing my mind in specific instances)
Good hunting. LB