Can this be used on natural gas grill orifices?

No. Heat is used to loosen this sealant. Use pipe dope.

Is this compatible with propane lines?

It should be I never used it I did used it on auto gas systems which are a propane mix

Would I need to use the 7649 primer if I was screwing a brass fitting (active metal) into a stainless steel (inactive metal)?

Actually I would recommend anti-seize compound. This will lock the thread where anti-seize will prevent reaction between dissimilar metals

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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577 Thread Sealant 50 mL Tube

Product ID: 45059808

Details

Brand
Loctite
Item Weight
0.07 Pounds
Item dimensions L x W x H
1 x 1 x 1
Material
Polymer-based
Style
Compact

🔧Medium-strength sealant for metal threads

⏱️Instant low-pressure sealing

❄️Effective at low temperatures

COP 106797

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Description

🔩 Seal it right, seal it tight — your pipes’ new best friend!

FAST INSTANT SEAL - Achieve a low-pressure seal immediately, minimizing downtime and boosting efficiency.
CHEMICAL THERMAL RESISTANCE - Gel-like formula resists chemical exposure and heat, ensuring long-term reliability.
RELIABLE METAL THREAD LOCKING - Seals and locks metal pipes and fittings with medium strength for lasting durability.
VERSATILE TEMPERATURE PERFORMANCE - Works flawlessly even in cold environments, perfect for all-season projects.
NO PRIMER NEEDED ON INACTIVE METALS - Simplifies application with curing on lightly contaminated surfaces, saving prep time.

Loctite 577 Thread Sealant is a medium-strength, general-purpose liquid designed to seal and lock metal threaded fittings instantly at low pressure. Its gel-like formula offers excellent chemical and thermal resistance, cures without primer on inactive metals, and performs reliably even at low temperatures, making it ideal for professional-grade plumbing and mechanical applications.

Specifications

ASIN	B01LPJ3LIM
Best Sellers Rank	#31,716 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #45 in Industrial Thread Sealants
Date First Available	October 11, 2016
Department	Adhesives, Sealants & Tapes
Item Weight	1.04 ounces
Item model number	2068749
Manufacturer	Loctite
Product Dimensions	1 x 1 x 1 inches

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COP 106797

Duties & taxes included

In stock

Sold byAmazon ColombiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Colombia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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