--- product_id: 30694019 title: "56521 High Performance Thread Sealant, 50 ml, White" brand: "permatex" price: "€ 30.84" currency: EUR in_stock: true reviews_count: 12 category: "Permatex" url: https://www.desertcart.at/products/30694019-56521-high-performance-thread-sealant-50-ml-white store_origin: AT region: Austria --- # Locks threads up to 10,000 PSI Temperature resistant -60°F to 300°F Fast, clean alternative to tape & dope 56521 High Performance Thread Sealant, 50 ml, White **Brand:** permatex **Price:** € 30.84 **Availability:** ✅ In Stock ## Summary > 🔧 Seal it tight, seal it right — the pro’s choice for leak-proof confidence! ## Quick Answers - **What is this?** 56521 High Performance Thread Sealant, 50 ml, White by permatex - **How much does it cost?** € 30.84 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/30694019-56521-high-performance-thread-sealant-50-ml-white) ## Best For - permatex enthusiasts ## Why This Product - Trusted permatex brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Precision & Flexibility:** Allows easy fitting adjustments before curing, unlike traditional Teflon tape—perfect for professional-grade results. - • **Corrosion & Galling Shield:** Protects metal threads from rust, corrosion, and galling, extending the life of your fittings. - • **Unmatched Pressure Defense:** Seals connections up to 1,000 PSI with rapid cure strength up to 10,000 PSI for leak-proof reliability. - • **Versatile Metal Compatibility:** Ideal for stainless steel, brass, titanium, and more—trusted by mechanics and DIY pros alike. - • **Extreme Temperature Resilience:** Operates flawlessly from freezing -60°F to scorching 300°F, perfect for demanding environments. ## Overview Permatex 56521 High Performance Thread Sealant is a premium white sealant designed for metal and tapered pipe threads, delivering airtight and watertight seals that withstand pressures up to 10,000 PSI and temperatures from -60°F to 300°F. It replaces traditional tapes with a fast-curing, corrosion-resistant formula trusted by professionals for over 20 years. ## Description Permatex High Performance Thread Sealant offers the ultimate sealing power with the added strength of a blue thread locker. This versatile sealant creates an airtight, watertight hold that prevents leaks, loosening, and corrosion, even under high pressures and temperatures. It seals connections up to 1,000 PSI, with a rapid cure capable of withstanding 10,000 PSI, ensuring leak-proof reliability for your toughest jobs. Temperature resistant from -60°F to 300°F, it’s designed specifically for metal and tapered pipe thread fittings, delivering protection against galling, rust, and corrosion over time. Ideal for stainless steel fittings, oil PSI sending units, oil and coolant lines, intake manifold switches, rear axle fill plugs, fuel fittings, and more, this high-performance thread sealant replaces traditional pipe tape and dope with a faster, cleaner application. Keep your metal connections locked and secure without the risk of leaks, making this sealant a must-have for both professional mechanics and DIY enthusiasts who need lasting, high-strength results. Review: 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 Review: 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) ## Features - These Are Complete Line Of Heavy-Duty Shop Products - These Products On Exceptionally High Order Fulfillment Rates, Breadth Of Available Products - Through Creativity, Productivity And Innovation - This Brand Continues To Develop The Finest Automotive Accessories - Part number: 56521 ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000FW7VHI | | Best Sellers Rank | #713 in Automotive ( See Top 100 in Automotive ) #4 in Thread Lock Sealers | | Date First Available | April 1, 2004 | | Department | Thread Sealants | | Is Discontinued By Manufacturer | No | | Item Weight | 1.76 ounces | | Item model number | 56521 | | Manufacturer | Permatex | | Product Dimensions | 8 x 3 x 2 inches | ## Product Details - **Brand:** Permatex - **Item Weight:** 0.11 Pounds - **Item dimensions L x W x H:** 8 x 3 x 2 inches - **Material:** Synthetic Rubber - **Style:** High Performance Thread Sealant ## Images ![56521 High Performance Thread Sealant, 50 ml, White - Image 1](https://m.media-amazon.com/images/I/71XJlR1DA2L.jpg) ## Available Options This product comes in different **Size, Style** options. ## Questions & Answers **Q: Does this stuff seal pneumatic (800 psi) threads on an and npt fittings.** A: 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** A: 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.** A: 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.** A: 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". ## Customer Reviews ### ⭐⭐⭐⭐⭐ Bulletproof seal on metal to metal joints! *by O***N on April 23, 2024* 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 ### ⭐⭐⭐⭐⭐ It works *by C***F on October 28, 2024* 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) ### ⭐⭐⭐⭐⭐ Great sealant *by K***R on October 13, 2025* Meets expectations ## Frequently Bought Together - 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 85080 Ultra Black Maximum Oil Resistance RTV Silicone Gasket Maker, Sensor Safe And Non-Corrosive, For High Flex And Oil Resistant Applications 9.5 oz - Permatex 22058 Dielectric Tune-Up Grease, 3oz. - High Performance Dielectric Grease Used To Protect Terminals, Spark Plugs, Wiring And Other Electrical Connections Against Salt, Dirt, And Corrosion --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.at/products/30694019-56521-high-performance-thread-sealant-50-ml-white](https://www.desertcart.at/products/30694019-56521-high-performance-thread-sealant-50-ml-white) --- *Product available on Desertcart Austria* *Store origin: AT* *Last updated: 2026-04-23*