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 Heavy Duty Threadlocker, 0.2 oz, Blue 242, 12 Pack

Product ID: 71918574

Details

Brand
Loctite
Item form
Gel
Material
Stainless
Special feature
Fast Drying
Specific uses for product
Automotive DIY

🔒Locks threads tight

⏱️Sets in 10 mins

🛠️Removable with hand tools

€ 173.83

Duties & taxes included

In stock

Sold byAmazon SpainDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Lock it down, loosen up later—thread security made smart!

FAST ACTING FORMULA - Sets in just 10 minutes, fully cures in 24 hours—get back to work faster
RUST LEAK DEFENSE - Seals threads to stop leaks and corrosion, extending equipment life
BULK PACK EFFICIENCY - 12 tubes of 6ml gel—perfect for pros who demand consistent performance
VIBRATION PROOF SECURITY - Prevents loosening on 6-20mm fasteners for ultimate reliability
SERVICE FRIENDLY STRENGTH - Medium strength locks but allows easy disassembly with hand tools

Loctite Heavy Duty Threadlocker Blue 242 is a medium-strength, fast-drying gel designed to lock and seal threaded fasteners from 6 to 20 mm, preventing loosening caused by vibration. Ideal for stainless steel and plated surfaces, it protects against leaks, rust, and corrosion while allowing easy removal with hand tools. Each pack includes 12 tubes of 6ml, curing fully in 24 hours, making it a trusted choice for automotive, construction, and DIY professionals.

Specifications

ASIN	B01EZTPX8A
Best Sellers Rank	865,946 in Automotive ( See Top 100 in Automotive ) 1,792 in Fillers, Adhesives & Sealants
Brand	Loctite
Colour	Blue
Compatible Material	Stainless Steel
Container Type	Box
Customer Reviews	4.9 4.9 out of 5 stars (53)
Full Cure Time	24 Hours
Global Trade Identification Number	30079340242006
Included Components	Threadlocker Tubes (12)
Item Form	Gel
Item Package Quantity	1
Item Type Name	Loctite Blue 242 Threadlocker 6-Milliliter Tubes, Case of 12 (209728-12)
Item Volume	6 Millilitres
Item Weight	45 g
Manufacturer	Henkel Corporation
Manufacturer Part Number	Loctite - 209728 - 12pk
Material	Stainless Steel
Model Number	209728-12
Number of Packs	12
Number of Pieces	1
Other Special Features of the Product	Fast Drying
Specific Uses For Product	Automotive, Construction, DIY Projects
UPC	707934024200
Unit Count	6.0 millilitre
Water Resistance Level	Not Water Resistant

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TrustScore 4.5 | 7,300+ reviews

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