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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Loctite 37421 271 Red Heavy Duty Threadlocker, 6-Milliliter Tube

Loctite 37421 271 Red Heavy Duty Threadlocker, 6-Milliliter Tube

Product ID: 298827944

Details

Brand
Loctite
Item Form
Tube
Material
Resin
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

155.87 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Lock it down like a pro — no loosening, no worries!

RAPID INITIAL SET - Get your project moving fast with a 10-minute tack time and full strength by next day
EXTREME CONDITION READY - Engineered to withstand heavy shock, vibration, and harsh chemical environments without fail
PROFESSIONAL GRADE STRENGTH - Trusted by OEMs and pros for unshakable hold on large bolts and studs
EASY DISASSEMBLY WHEN NEEDED - Localized heating plus hand tools make removal hassle-free despite its toughness
UNIVERSAL METAL COMPATIBILITY - Works flawlessly on stainless steel, aluminum, and plated surfaces—even with minor oil presence

Loctite 37421 271 Red Heavy Duty Threadlocker is a methacrylate-based adhesive designed for securing large bolts and studs (≥1 inch) in automotive and industrial applications. Trusted by professionals and OEMs, it bonds all metals including stainless steel and aluminum, tolerates minor oil contamination, and resists temperatures up to 140°F. It sets quickly in 10 minutes and fully cures in 24 hours, delivering durable, vibration-resistant performance with easy disassembly via localized heating.

Specifications

ASIN	B0028OJAIY
Brand	Loctite
Brand Name	Loctite
Colour	Red
Compatible Material	Aluminium
Container Type	Tube
Customer Reviews	4.8 out of 5 stars 1,062 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	5 g
Manufacturer	Loctite
Manufacturer Part Number	37421
Material	Methacrylate-based Resin
Material Type	Methacrylate-based Resin
Model	37421
Number of Pieces	1
Other Special Features of the Product	Strong
Special Feature	Strong
Specific Uses For Product	Automotive, Industrial, DIY, Furniture, Heavy-Duty
UPC	079340374218
Viscosity Level	Low
Volume	6 Millilitres
Water Resistance Level	Water Repellent

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