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".

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Description

🔧 Seal it. Lock it. Forget leaks forever.

MESS FREE APPLICATION - Say goodbye to tape and pipe dope—smooth, clean, and professional-grade sealing in one compact tube.
UNMATCHED SEAL HOLD - Combines thread sealant and blue thread locker for leak-proof, vibration-resistant connections.
PRESSURE PROOF PERFORMANCE - Secures fittings with airtight, watertight seals up to 1000 PSI—no leaks, no worries.
EXTREME TEMPERATURE DURABILITY - Operates flawlessly from freezing -60°F to scorching 300°F without cracking or weakening.
RAPID CURE HEAVY DUTY STRENGTH - Fast curing formula withstands up to 10,000 PSI, perfect for demanding industrial and automotive uses.

Permatex 56521 High Performance Thread Sealant is a synthetic rubber-based liquid designed for metal and tapered pipe threads. It delivers a dual-action seal and thread-locking hold that resists leaks and loosening under pressures up to 1000 PSI, with rapid curing strength up to 10,000 PSI. Temperature resistant from -60°F to 300°F, it protects against rust, corrosion, and wear, making it ideal for professional mechanics and DIYers seeking a reliable, mess-free alternative to traditional pipe tape and dope.

Specifications

Material	Synthetic Rubber
Brand	Permatex
Style	Compact
Item Weight	50 g
Item dimensions L x W x H	20.3 x 7.6 x 5.1 Centimeters
Water Resistance Level	Waterproof
Item Form	Liquid
UPC	079340565210
Net Quantity	50.0 millilitre
Global Trade Identification Number	00079340565210
Number of Items	1
Colour	White
Surface Recommendation	Fixture
Manufacturer	Permatex
Model number	56521
Item Weight	49.9 g
Product Dimensions	20.32 x 7.62 x 5.08 cm; 49.9 g
Item model number	56521
Item Height	2 Inches
Item Width	3 Inches
Included Components	Auto part, Automotive Accessories, Replacement and Performance parts
Are batteries included?	No

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