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

🔥Excellent chemical & thermal resistance

🔩Medium-strength sealant for metal threads

⏱️Instant low-pressure sealing

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Description

🔧 Seal smarter, not harder — lock in reliability with Loctite 577!

READY WHEN YOU ARE - Instant low-pressure seal means no waiting—get your projects moving faster.
STAY PUT GEL FORMULA - Gel-like consistency reduces migration, ensuring the sealant stays exactly where you apply it.
LOCK SEAL IN ONE GO - Medium-strength formula locks metal threads securely while sealing to prevent leaks.
NO PRIMER NO PROBLEM - Cures on lightly contaminated surfaces without primer, saving prep time and hassle.
BUILT FOR TOUGH CONDITIONS - Outstanding chemical and thermal resistance keeps seals intact under pressure and heat.

Loctite 577 is a medium-strength, general-purpose thread sealant designed for metal threads and fittings. It provides an instant low-pressure seal, excellent chemical and thermal resistance, and cures without primer on lightly contaminated surfaces. Its gel-like formula minimizes migration, making it ideal for overhead and low-temperature applications.

Specifications

ASIN	B01LPJ3LIM
Best Sellers Rank	#33,684 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #48 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.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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22608CFA

Duties & taxes included

In stock

Sold byAmazon Cote D' IvoireDelivered 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 Cote D' Ivoire.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

Yusuf A.

Fantastic experience overall. Will recommend to friends and family.

1 month ago

View all Trustpilot reviews