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

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

⏱️Instant low-pressure sealing

⚙️Medium-strength sealant for metal threads

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126 zł

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Sold byAmazon PolandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Seal it right, seal it tight — the pro’s choice for metal threads!

COLD WEATHER READY - Effective sealing performance even at low temperatures for on-the-spot fixes
DURABLE GEL FORMULA - Gel-like consistency prevents migration, shrinking, or shredding after application
FAST EASY APPLICATION - Instant low-pressure seal that cures without primers or heat
VERSATILE COMPATIBILITY - Works seamlessly on all metal types, even lightly contaminated surfaces
RELIABLE METAL THREAD LOCK - Seals and locks metal pipes with medium-strength confidence

Loctite 577 is a medium-strength, polymer-based thread sealant designed for metal pipes and fittings. It provides instant low-pressure sealing and locking for straight and taper threads, with excellent chemical and thermal resistance. Its gel-like formula minimizes migration and works effectively on lightly contaminated surfaces without requiring primers, making it ideal for fast, reliable sealing in professional and DIY applications.

Specifications

ASIN	B01LPJ3LIM
Best Sellers Rank	#37,968 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #51 in Industrial Thread Sealants
Brand Name	Loctite
Color	Yellow
Compatible Material	Metal
Customer Reviews	4.6 4.6 out of 5 stars (132)
Item Dimensions	1 x 1 x 1 inches
Item Form	Gel, Liquid
Item Weight	0.07 Pounds
Manufacturer	Loctite
Material Type	Polymer-based material
Model	2068749
Number of Items	1
Part Number	2068749
Style Name	Compact
Supported Standards	NSF
Surface Recommendation	Metal
UPC	079340010475
Unit Count	1.0 Count
Water Resistance Level	Water Resistant

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TrustScore 4.5 | 7,300+ reviews

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126 zł

Duties & taxes included

In stock

Sold byAmazon PolandDelivered 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 Poland.

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TrustScore 4.5 | 7,300+ reviews

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