Use blue picture on a few things mostly just bases

How many knew this about thread lockers...


"Because electrochemical activity is one of the two triggers that cause polymerization of the threadlocker fluid, care must be taken to avoid contaminating the entire container of threadlocker with threadlocker that has had contact with metal, otherwise the material in the container may polymerize."

Been using Guntite for a lot of years with no issues:

https://www.midwayusa.com/product/1006527431/uncle-mikes-gun-tite-removable-threadlocker-6ml-tube

It's definitely some weird stuff. There's a good Wikipedia article on the development of loctite...interesting.

Good discussion of a topic where there is no perfect answer, with the exception being Loctite Red or other premanent thread locking fluid. It's not a good solution unless you believe you will NEVER need to remove a screw. And never is a very long time.

Loctite used to never give a K value for their product nor a recommendation for torque. All they would say is to test on your own and calculate a K value right before your application. I would guess it was because of legal reasons and because their product changes viscosity under different temperatures.

I use blue and drop torque down 10-15% at room temp and haven't had any issues so far. No problems removing screws either... so far.

Good info. I use blue Loctite but I never thought about changing torque when using it. When you wade through the BS there are some pretty smart dudes hanging out here.

Low strength Loctite, and still torque to spec, on base to action, and ring cap screws. That's what I do.

The OP's question was addressed in depth here.......

https://www.24hourcampfire.com/ubbthreads/ubbthreads.php/topics/12394775/1

FWIW - I worked in the defense industry for 17 years with many brilliant engineers where it was established all fasteners required a locking mechanism with a Loctite type thread locker being much preferred over locking washers. Some of my airborne systems had in excess of 1,500 fasteners. I ran both a repair depot and production factory and will attest to thread locker being critical, especially for small screws. It is for this reason I always use Loctite blue or purple on all firearms. Proper torque is not enough for these small screws based upon my experience along with a lot of engineering analysis I've seen.

I've not had any difficulties removing scope rings or bases using blue or purple.