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.

Brand	Loctite
Specific Uses For Product	Automotive, Industrial, DIY, Furniture, Heavy-Duty
Material	Metal-based formulation
Item Form	Tube
Special Feature	Strong
Colour	Red
Item Package Quantity	1
Package Information	Tube
Item Volume	6 Millilitres
Viscosity	Low viscosity
Full Cure Time	24 Hours
Water Resistance Level	Water Repellent
Viscosity Level	Low
UPC	079340374218
Number of Pieces	1
Global Trade Identification Number	00079340374218
Manufacturer	Loctite
Model	LOCTITE 271 Threadlocker for Automotive \| Red, 6 ml Tube
Product Dimensions	16.51 x 9.69 x 2.03 cm; 4.54 g
Item model number	37421
Exterior	Packaged
Manufacturer Part Number	37421
OEM Part Number	37421
Stain Resistant?	Yes
Assembly Required	No
Special Features	Strong
Item Weight	4.54 g

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

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