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.Customs & duties included in the price

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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

R$263

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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	#46,699 in Industrial & Scientific (See Top 100 in Industrial & Scientific) #52 in Industrial Thread Sealants
Date First Available	October 11, 2016
Department	Adhesives, Sealants & Tapes
Item Model Number	2068749
Item Weight	1.04 ounces
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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The product quality is outstanding. Exactly what I needed for my work.

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R$263

Duties & taxes included

In stock

Sold byAmazon BrazilDelivered 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 Brazil.

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

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Great price for an authentic product. Fast international shipping too!

3 weeks ago

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