LoctiteThreadlocker Blue 242 - Removable Thread Lock Glue for Nuts, Bolts, & Fasteners, Medium Strength Screw Glue to Prevent Loosening & Corrosion - 6 ml, 1 Pack

Q: Is there a solvent or dremel attachement that will remove this stuff from bolt threads?

You don't need solvent or dremel. It will keep any screw or bolt from loosening, but you can get the bolt/screw out with a screwdriver and just brush off the Loctite. Very good stuff.

Q: Do I apply this to my doorknob set screw before screwing it in or after? (ie, a drop on top?)

Before. You apply this to the screw threads before screwing in. Make sure you only apply a very little bit. More is not better.

Q: how do I open the sealed tube? do I just poke a hole at the top?

I think it's best to use a thumbtack, safety pin, etc. to poke a hole into the flat tip. This will give you "droplet-sized control" in application.

Q: can this be used in glasses? The screws that hold the lenses in place?

No, it is designed for larger screws. Use Loctite 222 for small screws.

Product ID: 1998117

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Details

Brand
Loctite
Specific Uses For Product
Threadlocker
Material
ester
Compatible Material
Metal
Item Form
Liquid

🔩Works on 6-19mm fasteners

⏱️Sets in 10 minutes

🛡️Prevents rust & corrosion

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Description

🔒 Lock it down, but keep control—fast, firm, and removable!

VERSATILE FIT - Perfectly engineered for 6-19mm nuts and bolts—your all-in-one fastening solution
CORROSION SHIELD - Protects metal fasteners from rust and corrosion, extending equipment life
REMOVABLE CONTROL - Medium strength formula that locks tight but allows easy removal with hand tools
FAST ACTING LOCKDOWN - Sets in just 10 minutes to get you back to work faster
VIBRATION PROOF SECURITY - Stops loosening caused by vibration on motors, mowers, and power equipment

Loctite Threadlocker Blue 242 is a medium-strength adhesive designed to secure 6-19mm metal fasteners against loosening from vibration. It sets quickly in 10 minutes, fully cures in 24 hours, and protects against rust and corrosion while remaining removable with standard hand tools.