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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577 Thread Sealant 50 mL Tube | Medium Strength, For Metal Threads

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

🔥Excellent chemical & thermal resistance

🔩Medium-strength sealant for metal threads

⏱️Instant low-pressure sealing

924951₫

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Description

🔧 Lock it down, seal it tight—because your threads deserve the best!

RESISTANT RELIABLE - Gel-like consistency prevents migration, withstanding harsh chemicals and high temperatures.
NO PRIMER NO PROBLEM - Cures on lightly contaminated surfaces without primer, saving prep time and hassle.
SEAL LOCK IN ONE GO - Medium-strength formula ensures a secure, leak-proof bond on all metal threads.
FAST TRACK APPLICATION - Instant low-pressure seal means no waiting around—get your projects moving faster.
VERSATILE METAL COMPATIBILITY - Works seamlessly on all metal types, perfect for diverse industrial needs.

Loctite 577 is a medium-strength, general-purpose thread sealant designed for metal threads and fittings. It provides an instant low-pressure seal, locks and seals simultaneously, and offers excellent chemical and thermal resistance. Its gel-like formula minimizes migration and cures without primer on lightly contaminated surfaces, making it ideal for fast, reliable sealing in industrial and professional applications.

Specifications

ASIN	B01LPJ3LIM
Best Sellers Rank	#35,744 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #50 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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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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924951₫

Duties & taxes included

In stock

Sold byAmazon VietnamDelivered 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 Vietnam.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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