Red Loctite releases at somewhere between 400 and 450 degrees F. I don't remember which at the moment.
In the Corps, I used red loctite to secure the very heavy protected front sight on the Mossburg M590s and they never let loose. These were guns that would often get 3000 (yes three thousand!) rounds put through them in one day. Just make darn sure that you NEVER use it to lock a gun screw in place if it's something you'd rather not put heat to. It is totally impervious to any solvent in my experience.
Your mind is your primary weapon.