I use the the full strength loctite.
I only use it on the end few threads, if I can see the end of screw where it threads in I'll screw it in till just about all way in then put a small drop on let sit for a few secs and then finish screwing in. I haven't had an issue when it comes to undoing them. I wouldn't coat the whole thread.
A gun tuner actually recommended nail polish. Which makes sence too. Haven't tried that yet.
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