Red locktite on freeze plugs?

RustyRatRod said

Red and blue locktite are NOT sealers and a sealer is what you want. Use the right thing for the right application. I coat them with a thin bead of Permatex #2, but any good sealer will work.

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Rusty just gave the straight poop right here.

Most loctite products are not sealers. That doesn't mean some people don't use them as such.

The biggest thing about core plugs is the are installed straight, and not cocked. The sealer is just a backup.