Would this be 2 heavy for gun sight installation or just what i need?

It might be to much for 271. It was designed for larger treads 3/8 + hold, and might make it impossible to remove at a latter time because of inability to apply enough heat and torque to remove from small treads like a scope mount. use Blue which is for small threads

Does this product require a primer? The fourth picture on Amazon suggests it does but the instructions do not mention a primer. Stainless + aluminum

I didn't need to. I used it on steel threads. Didn't even clean them. Applied this product and assembled. Hardened in minutes. I waiyed 24hrs before use just in case. Excellent product. I've used in the automobile repair industry for 30yrs.

Would this be appropriate for the locking nut on a sink faucet, that is always coming loose and making the faucet wobble?

Oh god no! This is for applications of extreme vibration and areas that's could be extremely dangerous if a bolt or nut came loose. All you should need for you faucet is the blue loctite. After using the red, you would need some serious heat and a breaker bar to free that nut if you needed to replace that faucet in the future.

if it is opened/used, how long will it stay fresh/usable?

Unopened/opened shelf life of Loctite 271 is two years from date of manufacture. Since exposure to oxygen is what keeps the liquid product stable, and it is packaged in a "breathable" plastic bottle, there is no change in shelf life once the product has been opened.

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271 Threadlocker for Automotive: High-Strength, High-Temp, Fluorescent, Anaerobic | Red, 6mL Tube (PN: 37421-487232)

Product ID: 254870418

Details

Brand
LOCTITE
Item form
Tube
Material
Metal
Special features
Strong
Specific uses for product
Automotive DIY

🔥Heat removable for serviceability

🔩High-strength hold up to 3,000 PSI

⏱️Fast fixture time: 10 min steel cure

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€ 30.59

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Lock it down like a pro — strength that won’t quit!

RAPID CURING ACTION - Sets in 10 minutes, fully cures in 24 hours to keep projects moving
UV FLUORESCENT FORMULA - Easily inspect application with UV light for quality assurance
MILITARY GRADE STRENGTH - Tested to Mil-S-46163A for unmatched reliability
SHOCK VIBRATION RESISTANT - Locks fasteners tight even under extreme automotive stress
UNIVERSAL METAL COMPATIBILITY - Works flawlessly on stainless steel, aluminum, brass & more

Loctite 271 Threadlocker is a high-strength, red anaerobic adhesive designed for permanent locking and sealing of metal fasteners up to 1 inch. It cures rapidly (10 min fixture, 24 hr full cure), withstands temperatures from -65°F to 360°F, and resists shock, vibration, and chemical exposure. Military-spec tested and UV fluorescent for easy inspection, it’s the go-to solution for automotive, industrial, and heavy-duty applications.

Specifications

ASIN	B0028OJAIY
Best Sellers Rank	#63,919 in Automotive ( See Top 100 in Automotive ) #241 in Automotive Fillers, Adhesives & Sealants
Brand	LOCTITE
Brand Name	LOCTITE
Color	Red
Colour	Red
Compatible Material	Metal
Container Type	Tube
Customer Reviews	4.7 out of 5 stars 625 Reviews
Full Cure Time	24 Hours
Global Trade Identification Number	00079340374218
Included Components	(1) 271 Red Heavy Duty Threadlocker, 6-milliliter Tube
Item Form	Tube
Item Package Quantity	1
Item Type Name	automotive-thread-lock-sealers
Item Weight	0.01 Pounds
Item form	Tube
Manufacturer	Loctite
Material	Metal
Material Type	Metal
Model	37421
Other Special Features of the Product	Strong
Special features	Strong
Specific Uses For Product	Automotive, Industrial, DIY, Furniture, Heavy-Duty
Specific uses for product	Automotive, Industrial, DIY, Furniture, Heavy-Duty
UPC	079340374218
Unit Count	1 Count
Viscosity	Low viscosity
Volume	6 Milliliters
Water Resistance Level	Water Repellent

Reviews

D**É

Efficacité

Filetage adapteur pour moteur

7.08.2023

N**S

Did the job perfectly

5.08.2022

M**E

Cannot beat for large hardware in critical application

3.06.2025

N**E

tres bon produit

tres bon produits

1.03.2022

C**S

Thumbs up👍

3.05.2025

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In stock

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