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🔧 Seal it like a pro — no leaks, no limits!
Permatex 56521 High Performance Thread Sealant is a premium white sealant designed for metal and tapered pipe threads. It provides airtight, watertight seals that resist loosening, corrosion, and galling under pressures up to 1,000 PSI, with rapid cure strength up to 10,000 PSI. Temperature resistant from -60°F to 300°F, it’s ideal for automotive and industrial applications, delivering a cleaner, faster alternative to traditional pipe tape and dope.
| Asin | B000FW7VHI |
| Best Sellers Rank | #712 in Automotive (See Top 100 in Automotive) #3 in Thread Lock Sealers |
| Date First Available | April 1, 2004 |
| Department | Thread Sealants |
| Is Discontinued By Manufacturer | No |
| Item Model Number | 56521 |
| Item Weight | 1.76 ounces |
| Manufacturer | Permatex |
| Product Dimensions | 8 x 3 x 2 inches |
User
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.
User
Does at it says it does..
Used it for my Nissan rear differential. No issues.
User
Great sealant
Meets expectations
User
It works
I used this for the past few years on systems that use 300 PSI hot air and 250 PSI near cryogenic CO2; no leaks at all. It works far better than Teflon/PTFE tape or the more common thread sealants. I use the surface prep spray regardless of the material my fittings are made from. (successfully used on steel, stainless steel, brass, anodized aluminum, titanium)
User
Fixed a nice leak from engine block bolt
Slathered a little on the threads after a good cleaning of threads then torqued it down inside the boot hole and cured without leaks .
User
THREAD SEALANT
EXCELLANT LIQUID THREAD SEALANT
User
Bulletproof seal on metal to metal joints!
I use this for every metal to metal pipe fittings. Teflon tape is good but this thread sealant is much better and easier to use because it allows adjustment of the fittings to line up fittings which doesn't work when using Teflon tape. I make sure final adjustments are made within 1 hour as this sealant does cure in the absence of air in the close fitting metal to metal part of the joint and fully cures in 24 hours. If using on stainless steel or anodized aluminum or other inactive metals it's recommended that you use Permatex Surface Prep Activator to ensure proper cure. I was curious about using it on PVC, Permatex says it's NOT recommended for plastic fittings such as PVC. So I plumbed my shop with PVC and used teflon between the male PVC fittings and female metal fittings on all of my air drops and then use this Permatex 56521 sealant for everything else and it has worked without fail for more than 20 years. It's important if you use pvc to metal pipe be sure that the pvc fitting is the male and threaded into a female metal fitting. If you do it the other way around and use female pvc and thread male metal pipe into the pvc fitting it will expand the pvc over time and it will result in a leak. Just what I learned and hope it helps you out
User
Good value
Good price
User
Forget plumbers tape, this what you want
If plumbers tape was a model T Ford, this is a Ferrari. Awesome product.
User
Buen sellador
Cumple con su objetivo
User
Empaque abierto
El empaque del producto estaba abierto, lo cual demerita la presentación y se duda de la calidad.
User
No es para PVC
Recomiendan no usar con PVC
Trustpilot
1 month ago
2 months ago