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.

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.

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.

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.

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Loctite Threadlocker Tube

Product ID: 733231167

Details

Brand
Loctite
Color
Blue 242
Item Package Quantity
1
Material
Thread Sealant
Package Information
Tube

⏳24-hour full cure time

🔒110 PSI tensile strength

🔧Medium strength, hand-tool removable

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¥6733

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔩 Lock it down, loosen it up—confidence in every twist!

PERFECT BALANCE - Medium strength ensures firm hold yet easy removal with standard hand tools—no damage, no hassle.
TRUSTED QUALITY - Henkel’s Blue 242 formula, globally recognized with 4.8-star rating from 40,000+ pros.
LONG LASTING HOLD - Achieves full strength in 24 hours, providing durable, reliable fastening for your projects.
SECURE EVERY THREAD - Advanced formula locks metal fasteners tight against vibration-induced loosening.
PRECISION APPLICATION - Compact 6ml tube delivers controlled, mess-free sealing exactly where you need it.

Loctite Blue 242 Thread Locker is a medium-strength, 6ml tube of advanced thread sealant designed to prevent metal fasteners from loosening due to vibration. With a tensile strength of 110 PSI and a 24-hour full cure time, it offers a reliable hold that can still be removed with hand tools. Trusted by professionals worldwide, it ensures durable, mess-free fastening for all your metal assembly needs.

Specifications

ASIN	B000I1RSNS
Brand Name	Loctite
Color	Blue 242
Compatible Material	Metal
Container Type	Tube
Customer Reviews	4.8 4.8 out of 5 stars (40,815)
Global Trade Identification Number	00079340242005
Item Package Quantity	1
Item Weight	5 Grams
Manufacturer	Henkel
Material Type	Thread Sealant
Model	Henkel / osi -tanch-it-
Number of Pieces	1
Part Number	209728
Tensile Strength	110 Pounds Per Inch
UPC	079340242005
Volume	6 Milliliters

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