Permatex 56521 High Performance Thread Sealant ,Thread Lock & Screw Glue for Bolts Nuts & Fasteners to Prevent Loosening & Corrosion, Removable w/ Hand Tools 50 ml

Permatex 56521 High Performance Thread Sealant ,Thread Lock & Screw Glue for Bolts Nuts & Fasteners to Prevent Loosening & Corrosion, Removable w/ Hand Tools 50 ml

Q: 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

Q: 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.

Q: 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.

Q: 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".

Product ID: 30694019

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Details

Material
Synthetic
Brand
Permatex
Style
High Thread
Item Weight
0.11 Pounds
Item dimensions L x W x H
8 x 3 x 2

🔒1000 PSI seal

🔥-60°F to 300°F

⚙️10,000 PSI strength

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Description

🔧 Seal the Deal with Confidence!

MESS FREE APPLICATION - Eliminates the need for tape or pipe dope with a smooth, reliable seal.
RAPID CURING CAPABILITY - Cures quickly to handle up to 10,000 PSI, perfect for heavy-duty tasks.
UNMATCHED SEALING POWER - Combines thread sealant and blue thread locker for unbeatable hold.
HIGH PRESSURE PERFORMANCE - Airtight, watertight seal up to 1000 PSI for ultimate leak protection.
EXTREME TEMPERATURE RESISTANCE - Withstands temperatures from -60°F to 300°F, ensuring durability.

Permatex56521 High Performance Thread Sealant is a versatile solution designed to prevent loosening and corrosion in bolts, nuts, and fasteners. With a high-pressure seal of up to 1000 PSI and temperature resistance from -60°F to 300°F, this fast-curing sealant is perfect for both professional and DIY applications, ensuring a reliable, mess-free experience.

Specifications

Item Dimensions	8 x 3 x 2 inches
Item Weight	1.76 ounces
Color	White
Style Name	Compact
Surface Recommendation	Fixture
Item Form	Liquid
Compatible Material	Rubber
Material Type	Rubber

Have a Question? See What Others Asked

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

Can this be used on plastic pipe

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.

Reviews

J**C

Great automotive thread sealer

good product for use on automotive threads. was using this after changing transfer case fluid and differential fluid. always works well and when used properly no leaks!

9.09.2025

J**.

Zero leaks

Works great. Cures way faster when you get it hot.

8.09.2025

A**R

Works well

14.09.2025

R**O

Good thread sealant

Use case was to apply sealant to my new rear brake pressure switch for my Harley-Davidson Sportster XL1200C. Applied evenly and this little tube has WAY more (like at least 10X more) than I needed but will be a good addition to the shop. Excellent quality, but note you will have to massage the tube well to get all the fluid to mix easily for a consistent application. Recommended! Don’t settle for less than Permatex. Great value for money and flows evenly.

29.07.2025

V**T

Works well but very little product in 6ml tube.

Product seems to work fine. However, I purchased the small (6ml) tube and I could barely squeeze out two drops to seal a temp sender. This tube DEFINITELY did not contain 6ml. Otherwise I would have given it 5 stars as I like better than tape.

6.08.2025

Z**Z

Works Great!

I use for water pump and thermoset bell-housing bolts.

27.08.2025

K**Y

Worth the $

It works. No leaks!

26.08.2025

S**N

works great

works great no issues

15.08.2025

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