--- product_id: 31857662 title: "J-B Weld ExtremeHeat" brand: "j-b weld" price: "€ 17.10" currency: EUR in_stock: true reviews_count: 13 category: "J B Weld" url: https://www.desertcart.de/products/31857662-j-b-weld-extremeheat store_origin: DE region: Germany --- # Full cure in 24 hours Withstands up to 1000°F / 537°C Permanent bond stronger than steel J-B Weld ExtremeHeat **Brand:** j-b weld **Price:** € 17.10 **Availability:** ✅ In Stock ## Summary > 🔥 Fix it once, fix it forever — the ultimate heatproof repair paste! ## Quick Answers - **What is this?** J-B Weld ExtremeHeat by j-b weld - **How much does it cost?** € 17.10 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.de](https://www.desertcart.de/products/31857662-j-b-weld-extremeheat) ## Best For - j-b weld enthusiasts ## Why This Product - Trusted j-b weld brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Steel-Strong Bond:** Creates a permanent, machinable bond that outperforms traditional welding strength. - • **Extreme Heat Resistance:** Engineered to endure scorching temperatures up to 1000°F, perfect for high-heat repairs. - • **Long-Lasting Durability:** Waterproof and non-flammable, designed to withstand harsh environments and repeated heat cycles. - • **User-Friendly Application:** Cold weld formula requires no torch—just mix, apply, and cure for a hassle-free fix. - • **Versatile Metal Compatibility:** Seamlessly repairs iron, steel, alloy, and aluminum surfaces with ease. ## Overview J-B Weld 37901 ExtremeHeat is a high-temperature resistant metallic paste designed for permanent repairs on iron, steel, and metal surfaces exposed to extreme heat up to 1000°F (537°C). This non-flammable, solvent-free cold weld creates a bond stronger than steel that can be drilled, machined, or sanded after curing in 24 hours. Ideal for exhaust manifolds, grills, furnaces, and more, it offers a versatile, durable, and easy-to-use solution for professionals and DIYers alike. ## Description J-B Weld 37901 ExtremeHeat High Temperature Resistant Metallic Paste - 3 oz Review: Great product with long-term results, if you use it correctly! - I purchased this item to repair an ash fettle in an old Vermont Castings wood burning stove, and it completely exceeded my expectations outlasting an entire season of direct fire contact. The fettle was cracked into two pieces and a prior owner had drilled two holes on either side and tried to connect it with an aluminum "bridge." The repair interfered with the door closing, so I needed to seamlessly "weld" the two cast iron sides back together. Before going through the trouble of taking it to a welder and paying to have it repaired properly, I took a chance on this J-B Weld ExtremeHeat. I used a Dremel tool with a fine grinding stone and cleaned up the two broken faces, along with about 1/4 inch of the area on either side of the crack. Following the advice of another review, I then took a cotter pin, stuck it into the chuck of my battery powered drill, and used that to thoroughly stir the J-B Weld in the container (this is a one-time use container... once opened and stirred, use it and toss the rest). After stirring for just under 2 minutes, I immediately applied it to the two surfaces, pieced them together, and then spread a little more on either side to ensure a supported bond. I then set the item on a flat piece of cardboard to cure for 2 days. (NOTE: you have to support the joint while curing, because the J-B Weld provides no structural support until completely cured. While wet, the item will just fall apart again if the pieces aren't otherwise held together.) When it was done, I replaced the fettle and lit the first fire of the season (crossing my fingers at the same time). Several months and probably 100+ fires later, the piece was still holding strong like the day I put it in. The fettle sits right against the fire, and many logs have rolled into it while it was extremely hot, with no noticeable damage whatsoever. I would absolutely recommend and use the J-B Weld ExtremeHeat again on future projects. As long as the proper preparation is done, and you follow the instructions, it's an awesome product! Review: Exhaust manifold Gasket failed..JB to the rescue. - I used JB Weld 36901 Extreme heat. to stop and exhaust manifold leak. A section of the gasket was missing. I just wanted a temp fix so it didn't damage the head on my tractor. This stuff worked great. ## Features - Jb Weld Extreme Heat: Is Formulated For Repairs To Iron, Steel And Metal In High Temperature Environments 1000°F / 537°C. Non-Flammable, It Contains No Solvents Or Volatile Organic Compounds (Vocs). - The Original Cold Weld: Jb Weld Was Developed As An Alternative To Torch Welding. Designed To Be Effective In Extreme Environments, Once It Sets, It Creates A Permanent Bond Stronger Than Steel. - Simple To Use: When Fully Cured, This Metallic Compound Can Be Drilled, Machined Or Sanded. It Is Great For Repairing Cracks, Small Gaps, Seam Connections Or Holes. - Versatile & Dependable: Ideal For Repair Work On : Exhaust Manifolds, Pipe Connections, Mufflers, Catalytic Converters, Outdoor Grills, Fire Boxes, Gas And Commercial Furnaces And Water Heaters. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01IBOBY74 | | Best Sellers Rank | #1,101 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #7 in Industrial Lubricants | | Brand | J-B Weld | | Brand Name | J-B Weld | | Color | Grey | | Compatible Material | Alloy Steel, Iron | | Container Type | Tube | | Customer Reviews | 4.2 out of 5 stars 12,262 Reviews | | Full Cure Time | 24 hours | | Global Trade Identification Number | 00043425379016 | | Included Components | Metallic Paste Repair Bottle 3 oz. | | Item Form | Paste | | Item Package Quantity | 1 | | Item Type Name | ExtremeHeat High Temperature Resistant Metallic Paste - 3 oz | | Item Weight | 3.04 ounces | | Manufacturer | JBWeld | | Material | Metal, Aluminum | | Material Type | Metal, Aluminum | | Model | 37901 | | Number of Pieces | 1 | | Other Special Features of the Product | Heat Resistant | | Part Number | 37901UK | | Special Feature | Heat Resistant | | Specific Uses For Product | ['Repair', 'High Temperature Environments'] | | UPC | 043425379016 | | Unit Count | 3 Ounce | | Viscosity Level | High | | Volume | 3 fluid ounces | | Warranty Description | No Warranty | | Water Resistance Level | Waterproof | ## Product Details - **Brand:** J-B Weld - **Item Form:** Paste - **Material:** Metal, Aluminum - **Special Feature:** Heat Resistant - **Specific Uses For Product:** ['Repair', 'High Temperature Environments'] ## Images ![J-B Weld ExtremeHeat - Image 1](https://m.media-amazon.com/images/I/71LArrmzUqL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: Can I use this to repair a stove burner grate? I dropped it and the pieces need to glued together. Thanks** A: No, this will not provide any type of structural support. This is a filler, we also do not recommend any of our products to be in direct flame. Thank you, J-B Weld Support **Q: Is this waterproof?** A: This is not waterproof. Left open to water/rain, this product will completely dissolve. **Q: Can this be used to"glue 2 pieces of metal together?** A: No. As per the manufacturer, it is "for repairing cracks, small gaps, seam connections or holes in exhaust manifolds, pipe connections, mufflers, catalytic converters, outdoor grills, fire boxes, gas and commercial furnaces and water heaters." It is NOT designed to bond two separate pieces together. **Q: Can i use this on an engine block steipped bolt hole?** A: I assume you meant "stripped". Is it one of the head bolt holes or another hole for mounting something else? If it is a head bolt hole, I'd use a heli-coil instead. JB Weld isn't very structural in strength. It's good in compression, but not sure about tension, torsion, or shear forces. In one of the questions, a JB Weld Support rep said "No, this will not provide any type of structural support", so I'd go with heli-coil instead. That will also keep the bolt hole centered closer to where it is now. With JB Weld the hole may end up in a slightly different location which would probably not be good. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great product with long-term results, if you use it correctly! *by A***E on July 7, 2022* I purchased this item to repair an ash fettle in an old Vermont Castings wood burning stove, and it completely exceeded my expectations outlasting an entire season of direct fire contact. The fettle was cracked into two pieces and a prior owner had drilled two holes on either side and tried to connect it with an aluminum "bridge." The repair interfered with the door closing, so I needed to seamlessly "weld" the two cast iron sides back together. Before going through the trouble of taking it to a welder and paying to have it repaired properly, I took a chance on this J-B Weld ExtremeHeat. I used a Dremel tool with a fine grinding stone and cleaned up the two broken faces, along with about 1/4 inch of the area on either side of the crack. Following the advice of another review, I then took a cotter pin, stuck it into the chuck of my battery powered drill, and used that to thoroughly stir the J-B Weld in the container (this is a one-time use container... once opened and stirred, use it and toss the rest). After stirring for just under 2 minutes, I immediately applied it to the two surfaces, pieced them together, and then spread a little more on either side to ensure a supported bond. I then set the item on a flat piece of cardboard to cure for 2 days. (NOTE: you have to support the joint while curing, because the J-B Weld provides no structural support until completely cured. While wet, the item will just fall apart again if the pieces aren't otherwise held together.) When it was done, I replaced the fettle and lit the first fire of the season (crossing my fingers at the same time). Several months and probably 100+ fires later, the piece was still holding strong like the day I put it in. The fettle sits right against the fire, and many logs have rolled into it while it was extremely hot, with no noticeable damage whatsoever. I would absolutely recommend and use the J-B Weld ExtremeHeat again on future projects. As long as the proper preparation is done, and you follow the instructions, it's an awesome product! ### ⭐⭐⭐⭐⭐ Exhaust manifold Gasket failed..JB to the rescue. *by L***R on July 17, 2026* I used JB Weld 36901 Extreme heat. to stop and exhaust manifold leak. A section of the gasket was missing. I just wanted a temp fix so it didn't damage the head on my tractor. This stuff worked great. ### ⭐⭐⭐⭐ Important to know information about this product *by M***F on April 29, 2024* Here's what is true. If seal is broken, contents can set up upon arrival. If sealed, there's no problem. You will need to provide your own mixing amd application stick. This product will not hold a broken exhaust system together. It only works well as a filler to patch hole. Even once product is mixed and dries, it will turn back to mush if soaked in water. I tested that. That is true. However, once the product fully cures after 24hrs and is subjected to exhaust temperatures of 480 to 500 degrees or more, it will fully set. It can start to bubble after it flashes off. Stinks really bad when exhaust heats up but goes away after a 20 minute drive. As you can see, my motorcycle exhaust had pin holes that needed filling. I used the entire mixture applying back over the holes as the product will settle down in the holes. Anything bigger than a BB I recommend using a metal screen for added support. Not sure how long this may last but I have gone on several 2 hour rides and it is still holding up well. I can't see this dissolving in water now that it has been fully cured by the heat of the exhaust, but time will tell. Happy so far. Just remember. It's a filler. It will not work to hold anything together. ## Frequently Bought Together - J-B Weld 37901 ExtremeHeat High Temperature Resistant Metallic Paste - 3 oz - J-B Weld ExhaustWeld 2" x 72" Repair Wrap, White - J-B Weld High Heat Epoxy Syringe, Dark Grey --- ## 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.de/products/31857662-j-b-weld-extremeheat](https://www.desertcart.de/products/31857662-j-b-weld-extremeheat) --- *Product available on Desertcart Germany* *Store origin: DE* *Last updated: 2026-07-30*