Would it be good to use this to prime Barrel Threads with certain coatings before using threadlock for mounting different Muzzle devices?

Nope it contains acetone. It will take the bluing off.

What is the difference between this and 19269 / 7649? I'd like to use a primer for 271. TY.

7649 type of primer and this is primer N and 19269 size and type of container , this one is 1.75 fluid ounce glass bottle.

Is this primer necessary when only on surface is inactive, as in moly steel and aluminum?

Since Loctite anaerobic products cure through both the absence of oxygen and the presence of active metal ions, it is often suggested to use a primer on the surface of inactive metals, such as the ones mentioned, in order to achieve a cure time that is similar to that on an active metal, such as steel. The primer may not always be required though, so it is always best to test it for your application.

Should I use this on loctite 545 with brass and stainless threads?

If applied to stainless, it will speed the cure from that side. Since brass is very "active", not required on that side. Because the brass is so active, may not even need the primer on the stainless.

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🛠️ Prime your projects with power and precision—don’t let inactive surfaces hold you back!

PRECISION FIT - Optimized for fasteners from 0.08” to 0.5” ensuring perfect application every time
UNIVERSAL METAL PRIMER - Activates adhesion on stainless steel, gold, silver & aluminum for flawless bonding
COLD WEATHER PERFORMANCE - Reliable curing below 41°F keeps your projects on schedule, no matter the season
VERSATILE INDUSTRIAL USE - Ideal for valve covers, oil pans, alternators, and more—engineered for professional-grade results
TRUSTED QUALITY ASSURANCE - Premium formula trusted by pros to enhance durability, style, and functionality

Loctite 37509 Klean 'N Prime Anaerobic Activator is a 4.5 oz aerosol primer designed to activate adhesion on inactive and passive metal surfaces including plated parts, stainless steel, and aluminum. It accelerates cure times for anaerobic adhesives even in cold conditions below 41°F, fitting fasteners from 0.08” to 0.5” (2.2-12 mm). Perfect for automotive and industrial applications, it ensures reliable, professional-grade bonding and enhanced durability.

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