Does this stuff seal pneumatic (800 psi) threads on an and npt fittings.

I’ve not used it for your application however, her is the product discription for reference Formulated for metal, tapered ppe thread fittings. Protects threaded areas from rust and corrosion. Uses: head bolts, oil senders, oil and coolant lines, fuel fittings. Features & details Cures rapidly to withstand 10,000 PSI Perfect as a replacement for Vibra-Seal pre-coated parts Prevents galling and protects mated threaded areas from rust and corrosion

Can this be used on plastic pipe

Here is a copy and paste of the product description. "Formulated for metal, tapered ppe thread fittings. Protects threaded areas from rust and corrosion. Uses: head bolts, oil senders, oil and coolant lines, fuel fittings". Hope this helps.

What's the difference between this & Special Edition? I need 2 use it 2 seal inline fuel filter thread brass fitting 4 a motorcycle tank 2 carb.

I tried a number of things to seal a brass tee into a motorcycle oil pressure outlet. Nothing worked 'til I tried this stuff. Be sure to clean the threads well beforehand. If the stuff is rated for fuel, I'm sure it'll work for your application. It's good stuff.

What's the difference between this & Special Edition? I need 2 use it 2 seal inline fuel filter thread brass fitting 4 a motorcycle tank 2 carb.

The special edition is no doubt like many other products listed on Amazon a seller attempting to use the false label of a "special edition" to lure buyers to buy from them at a higher price, without prime shipping and more often than not slower shipping. I am willing to bet if you contact the maker of the product that they do not produce a "special edition".

Permatex 56521 High Performance Thread Sealant 50 Ml

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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€ 35.92

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Sold byAmazon NetherlandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Seal it like a pro — don’t let leaks steal your spotlight!

CORROSION LEAK DEFENSE - Creates an airtight, watertight barrier that prevents rust, galling, and leaks over time.
UNMATCHED THREAD SECURITY - High-strength sealant locks connections up to 10,000 PSI, ensuring zero loosening under pressure.
CLEAN EFFICIENT APPLICATION - Replaces messy tapes and dopes with a fast-curing, no-fuss liquid formula for professional results.
VERSATILE METAL COMPATIBILITY - Optimized for stainless steel and metal alloys, ideal for automotive, industrial, and DIY projects.
EXTREME TEMPERATURE RESILIENCE - Performs flawlessly from freezing -60°F to scorching 300°F, perfect for any environment.

Permatex 56521 High Performance Thread Sealant is a premium synthetic rubber formula designed to lock metal and tapered pipe threads with a waterproof, corrosion-resistant seal. It withstands pressures up to 10,000 PSI and temperatures from -60°F to 300°F, delivering fast curing and reliable protection for automotive and industrial applications. Trusted by professionals and DIYers alike, it replaces traditional tapes with a cleaner, stronger, and longer-lasting solution.

Specifications

ASIN	B000FW7VHI
Best Sellers Rank	#151,307 in Car & Motorbike ( See Top 100 in Car & Motorbike ) #147 in Fillers, Adhesives & Sealants
Brand	Permatex
Brand Name	Permatex
Colour	White
Compatible Material	Stainless Steel, Metal Alloys
Country of Publication	USA
Customer Reviews	4.7 out of 5 stars 534 Reviews
Global Trade Identification Number	00079340565210
Included Components	Auto part, Automotive Accessories, Replacement and Performance parts
Item Dimensions	20.3 x 7.6 x 5.1 Centimeters
Item Form	Liquid
Item Type Name	Thread Sealant
Item Weight	50 g
Item dimensions L x W x H	20.3 x 7.6 x 5.1 Centimeters
Manufacturer	Permatex
Material	Synthetic Rubber
Material Type	Synthetic Rubber
Style	Compact
Style Name	Compact
Surface Recommendation	Fixture
UPC	079340565210
Unit Count	50.0 Milliliters
Water Resistance Level	Waterproof

Reviews

A**R

Forget plumbers tape, this what you want

If plumbers tape was a model T Ford, this is a Ferrari. Awesome product.

31.05.2024

P**E

Buen sellador

Cumple con su objetivo

22.02.2024

K**Y

Works great

Sorted my leaking head bolts in an Ls. Used arp but the chromolly bolts don’t come with sealer like all the stock and stock replacement bolts do. Put on 3/4 of thread and install. Perfect. Further used on head plugs. Sealed up also without leaks. The stuff is incredible for automotive.

22.05.2026

E**.

Empaque abierto

El empaque del producto estaba abierto, lo cual demerita la presentación y se duda de la calidad.

25.02.2025

C**S

Does at it says it does..

Used it for my Nissan rear differential. No issues.

14.04.2026

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