is loctite 577 or 567 better for engine coolant fittings on an automobile engine to prevent leaking?

I have only used the 577 on a boiler heating system which contained a 50% solution of antifreeze. So far it has been the only product that worked. The 567 is similar to 577 but the 577 is better for coarse threads.

If possible, can you please provide me the manufacturing date and the expiration date of this product? I need Loctite 577 that has longer shelf life.

This item has a shelf life of 2 years. Each item will have a manufacture batch code and you would need to contact Loctite directly in order to find out when it was manufactured.

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231119 Yellow 577 Medium Strength Liquid Thread Sealant, 50 mL Tube

231119 Yellow 577 Medium Strength Liquid Thread Sealant, 50 mL Tube

Product ID: 14653008

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Details

Material
Polymer-Based
Brand
Loctite
Style
Compact
Item Weight
2.88 ounces
Water Resistance Level
Water

💧Liquid formula ensures tight thread lock

🛠️Medium strength for reliable sealing

🇺🇸Made in the USA for trusted quality

Description

🔧 Lock it down with confidence—never worry about loose threads again!

VERSATILE USE - Ideal for metal fasteners in automotive, industrial, and home repairs
COMPACT 50 M L TUBE - Perfect size for professional and DIY projects alike
PRECISION THREAD LOCKING - Medium strength formula secures fasteners without damage
SMOOTH LIQUID APPLICATION - Easy-to-use liquid consistency for seamless sealing
TRUSTED AMERICAN CRAFTSMANSHIP - Manufactured in the USA ensuring premium quality standards

Loctite 231119 Yellow 577 is a medium strength liquid thread sealant in a convenient 50 mL tube, designed to securely lock metal fasteners while allowing future disassembly. Made in the USA, it offers reliable sealing performance for professional and DIY applications.

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