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: 89487863

Details

Brand
Loctite
Style
Compact
Item dimensions L x W x H
25 x 25 x 25
Compatible material
Metal
Item form
Liquid Gel

🔒Medium-strength lock & seal

🧪Chemical & thermal resistant

❄️Fast cure at low temps

E£ 8559

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Sold byAmazon EGYPTDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Lock it down, seal it tight—because leaks are so last season!

GEL LIKE FORMULA - Minimizes migration and mess, keeping your workspace clean and efficient.
NO PRIMER NEEDED - Cures on lightly contaminated and inactive metal surfaces—simplify prep work.
DURABLE RELIABLE - Resists chemicals, heat, and won’t shrink or shred—built to last under pressure.
SEAL LOCK IN ONE STEP - Instantly fills and secures threaded fittings for leak-proof confidence.
WORKS IN CHILLY CONDITIONS - Fast application and curing even at low temperatures—no downtime needed.

Loctite 577 is a medium-strength, acrylic-based thread sealant designed for straight and taper threaded metal fittings. It provides instant low-pressure sealing and locking, cures quickly even at low temperatures without primer, and offers excellent chemical and thermal resistance with minimal product migration.

Specifications

ASIN	B01LPJ3LIM
Batteries Required?	No
Batteries included?	No
Best Sellers Rank	292,455 in DIY & Tools ( See Top 100 in DIY & Tools ) 2,891 in Sealers
Colour	Yellow
Customer Reviews	4.6 4.6 out of 5 stars (143)
Date First Available	11 Oct. 2016
Guaranteed software updates until	unknown
Item Package Quantity	1
Item Weight	29.5 g
Item model number	2068749
Manufacturer	Loctite
Material	Acrylic
Measurement System	US
Part number	2068749
Product Dimensions	2.54 x 2.54 x 2.54 cm; 29.48 g
Size	1-(Pack)
Style	Compact

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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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TrustScore 4.5 | 7,300+ reviews

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

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

2 weeks ago

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E£ 8559

Duties & taxes included

In stock

Sold byAmazon EGYPTDelivered 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 EGYPT.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

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Perfect platform for hard-to-find items. Delivery was prompt.

1 month ago

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