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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🔧 Lock it down, heat it up, never let go!

FLUORESCENT VISIBILITY - Quickly inspect application with built-in fluorescent properties for professional precision.
RAPID 10 MINUTE SET TIME - Minimize downtime with a fast initial cure, fully hardened in 24 hours for peak performance.
UNBREAKABLE BONDING POWER - Secures critical automotive fasteners against shock and vibration with industrial-grade strength.
HEAT ACTIVATED REMOVABILITY - Easily disassemble parts when needed using localized heat—no damage, no hassle.
UNIVERSAL METAL COMPATIBILITY - Works flawlessly on stainless steel, aluminum, plated surfaces, and more—oil tolerant for real-world conditions.

LOCTITE271 is a high-strength, high-temperature threadlocker designed for automotive fasteners up to 1 inch. It bonds all metal types, including passive substrates, with improved oil tolerance. The anaerobic formula cures quickly in 10 minutes and fully in 24 hours, providing durable resistance to shock, vibration, and harsh environments. Removal requires localized heat, ensuring secure yet serviceable fastening.

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Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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Great experience from order to delivery. Highly recommended!

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Manufacturer	Loctite
Brand	LOCTITE
Model	Loctite 487232 Threadlocker 271 High Strength Tube, Red, 6-ml
Product Dimensions	16.51 x 9.69 x 2.03 cm; 4.54 g
Item model number	37421
Exterior	Smooth
Manufacturer Part Number	37421
OEM Part Number	37421
Special Features	Strong
Item Weight	4.54 g
Viscosity	Low viscosity

LOCTITE271 Threadlocker for Automotive: High-Strength, High-Temp, Fluorescent, Anaerobic | Red, 6mL Tube (PN: 37421-487232)

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