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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37421 271 Red Heavy Duty Threadlocker, 6-Milliliter Tube

Product ID: 298827944

Details

Brand
Loctite
Item Form
Tube
Material
Metal-based
Special Feature
Strong
Specific Uses For Product
Automotive DIY

🔥Heat resistant up to 140°F

🔩High-strength bond for heavy-duty bolts

⏱️Sets in 10 minutes, full cure in 24h

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1295115₫

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Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Lock it down like a pro — don’t let your bolts bail on you!

EASY DISASSEMBLY - Requires only localized heating and hand tools for hassle-free maintenance.
RAPID INITIAL SET - Starts curing in just 10 minutes to keep your project moving fast.
EXTREME DURABILITY - Engineered to withstand heavy shock, vibration, and harsh chemical environments without fail.
ALL METAL COMPATIBILITY - Works flawlessly on stainless steel, aluminum, and plated surfaces—even with minor oil presence.
PROFESSIONAL GRADE STRENGTH - Trusted by OEMs and pros for securing large bolts and studs over 1 inch.

LOCTITE 37421 Red Heavy Duty Threadlocker is a professional-grade adhesive designed for large bolts and studs, delivering a rapid 10-minute set and full strength in 24 hours. Trusted by automotive OEMs and professionals, it bonds to all metals including stainless steel and aluminum, tolerates minor oil contamination, and resists shocks, vibrations, and temperatures up to 140°F. Ideal for heavy-duty automotive and industrial applications, it ensures durable, reliable fastening with easy disassembly when needed.

Specifications

ASIN	B0028OJAIY
Brand	Loctite
Brand Name	Loctite
Colour	Red
Compatible Material	Aluminium
Container Type	Tube
Customer Reviews	4.8 out of 5 stars 1,035 Reviews
Full Cure Time	24 Hours
Global Trade Identification Number	00079340374218
Included Components	(1) LOCTITE 271 Threadlocker for Automotive \| Red, 6 ml Tube
Item Form	Tube
Item Package Quantity	1
Item Type Name	Loctite 487232 Threadlocker 271 High Strength Tube, Red, 6-ml
Item Weight	0.01 Pounds
Manufacturer	Loctite
Material	Metal-based formulation
Material Type	Metal-based formulation
Model	37421
Other Special Features of the Product	Strong
Special Feature	Strong
Specific Uses For Product	Automotive, Industrial, DIY, Furniture, Heavy-Duty
UPC	079340374218
Viscosity	Low viscosity
Volume	6 Millilitres
Water Resistance Level	Water Repellent

Reviews

D**É

Efficacité

Filetage adapteur pour moteur

7.08.2023

J**.

Buena compra

Rinde mucho y es un producto y marca que cumple lo que promete

20.06.2022

A**M

Works

9.08.2025

N**S

Did the job perfectly

5.08.2022

J**J

buena calidad

Llega a tiempo y Excelente producto

13.04.2022

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