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What’s that blue shit on screws

Bridgebuilder34

Private
Minuteman
Feb 13, 2021
53
20
CA
I notice this blue shit on the screws that usually come with an optic/rings/mounts etc. what is it? I get the dremel with a wire/brush attachment and clean it off.
 

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Is that rubbery blue stuff available to consumers? It just seems more practical than the liquid threadlock commonly found.
Like @spife7980 said, the closest product available to the consumer is Vibra-Tite VC-3. The pre-applied factory screws are a nylon paste or powder on flux that is baked on. I did happen to find an industrial product that worked well, but it's not common and expensive.
 
Now I understand why there are so many idiots on a pistol forum complaining about their red dots or mounting plates coming loose

I would have thought that men wouldn't find assembling simple things a challenge but I was wrong.