--- product_id: 5489514 title: "J-B Weld 40001 Wood Restore Liquid Hardener - 16 oz., Original Version" brand: "j-b weld" price: "Β₯7957" currency: JPY in_stock: true reviews_count: 13 url: https://www.desertcart.jp/products/5489514-j-b-weld-40001-wood-restore-liquid-hardener-16-oz store_origin: JP region: Japan --- # Moisture reduction in wood Deep wood fiber reinforcement Quick drying formula J-B Weld 40001 Wood Restore Liquid Hardener - 16 oz., Original Version **Brand:** j-b weld **Price:** Β₯7957 **Availability:** βœ… In Stock ## Summary > πŸ› οΈ Restore, Reinforce, Repeat β€” Wood Repair Made Effortless ## Quick Answers - **What is this?** J-B Weld 40001 Wood Restore Liquid Hardener - 16 oz., Original Version by j-b weld - **How much does it cost?** Β₯7957 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/5489514-j-b-weld-40001-wood-restore-liquid-hardener-16-oz) ## 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 - β€’ **One-Step Application:** No mixing neededβ€”brush on and go for hassle-free repairs - β€’ **Pro-Grade Durability:** Trusted by builders and mechanics for rock-solid results - β€’ **Versatile Restoration:** Perfect for window sills, door frames, fences, and antique furniture - β€’ **Moisture Barrier Boost:** Reduces moisture to stop further decay before filling - β€’ **Fast-Acting Wood Savior:** Seals and hardens rotted wood in hours, not days ## Overview J-B Weld 40001 Wood Restore Liquid Hardener is a professional-grade, quick-drying liquid designed to penetrate and reinforce decayed or rotted wood. It reduces moisture content, halting further damage and creating a solid base for wood fillers. Ideal for a wide range of wood repair projects, this one-component formula offers easy brush-on application trusted by pros to deliver durable, water-resistant restoration. ## Description J-B Wood Restore Liquid Hardener is a quick drying liquid for sealing and reinforcing decayed or rotted wood; for reducing moisture in decaying or rotted wood surfaces, prior to putty filling. The special liquid formula penetrates the wood to reinforce the fibers stopping further decay and providing a solid base for J-B Wood Filler Compound. Review: This product is a game changer for home repair - This product is extremely handy when you have storm damage in your attic. It's also handy for wooden window sills or dormers, where cooling water has caused severe softening. This stuff penetrates deep into softened damaged wood and makes it Rock Solid again. That allows you to use filler and waterproofing materials rather than rip out all of the wood and start over. Review: This bloody stuff works! Special needs though. - Had an old set of windows in a very old house. House not worth all new windows due to other problems. Sills were rotted and water would just go down the cracks and fester. Wood was punky or soft and wouldn't keep any paint. Used a similar (but two part) epoxy product in Alaska before and it worked great. Thought I'd try this one part product. I will never go back to a two part system. This product penetrated the compromised wood quite deep down and solidified it. The next day I was able to putty the cracks and low spots and the putty stayed in place tightly. When using an electric dual action sander the putty did not loosen at all. After painting you couldn't tell they were ever damaged. CAUTIONS: Wait till the wood is completely dry. Remove any loose chunks and dust. I used light pressure with a wire brush and vacuumed the debris. In poor weather tarp the area and use an electric hair dryer or heat gun to dry surface quickly. Put putty on after this product, not before. USE GLOVES. Some people could be allergic to uncured product. Also use safety glasses if you are using air to blow out the debris. I prefer to vacuum the debris up instead of blowing them away. Also if the area below the window is one you don't want to leave a permanent unsightly stain on shield the area from drips. Don't pour on thick, often one wet coat will do it. A brush is recommended to get deep penetration into the cracks. One bottle will usually take care of two 36" inch sills or several smaller patches. If in doubt, buy two. If you don't have enough to completely fix a bad spot don't use it at all until you have enough product. Otherwise you will semi-seal up the surface and the new product will not penetrate the surface. I left the patches to dry overnight but if the surface is hard and not tacky after 2-3 hours you could lightly sand if needed and putty could be applied. Don't use heat to accelerate the drying process in the first hour or the penetration will not be as deep. A hair dryer will speed up the process though if the wood was good and dry before treating it with the j-b weld product. Acetone will clean up any dripping but also could affect the finish of the surface you are trying to clean, so the best technique is to mask as needed and watch for drips for the first 5 or 10 minutes. A throw away brush is what I recommend. After trying to clean up a brush I used with this stuff I spent more on acetone than the cost of the brush, let alone the time. Have fun and be prepared to be amazed. ## Features - JB WOOD RESTORE LIQUID HARDENER: Is a quick drying liquid for sealing and reinforcing decayed or rotted wood; for reducing moisture in decaying or rotted wood surfaces, prior to putty filling. - WHAT THE PROFESSIONALS USE: Builders, mechanics & repair pros know our products bond strong to a variety of surfaces in even the toughest environments. Choose the product pros trust for your project. - WOOD PREPARATION: The special liquid formula penetrates the wood to reinforce the fibers stopping further decay and providing a solid base for J-B Wood Filler Compound. Easy brush on, no mix formula. - VERSATILE & DEPENDABLE: Ideal on door frames, window frames, sills, sashes, eaves, columns, posts, garages, fences, antique furniture, corner boards and much more! - NO PROJECT TOO BIG OR TOO SMALL: We have all the products you need to get the job done right. JB Weld always delivers the legendary performance of the World's Strongest Bond. - Seals rotted wood surfaces - Dries quickly - This is an easy one component application - This eliminates moisture in wet wood surfaces - Provides a solid, stable base for wood fillers or putties ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B005493J1E | | Best Sellers Rank | #87,669 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #64 in Wood Glue | | Brand | J-B Weld | | Brand Name | J-B Weld | | Color | Clear to Amber | | Compatible Material | Wood | | Container Type | Bottle | | Customer Reviews | 4.6 out of 5 stars 1,213 Reviews | | Global Trade Identification Number | 00043425400017 | | Included Components | Wood Sealer Liquid Hardener-Bottle-Cylinder 16 oz | | Item Form | Liquid | | Item Package Quantity | 1 | | Item Type Name | Liquid Hardener - 16 oz. | | Item Weight | 16 ounces | | Manufacturer | JBWeld | | Material | Blend | | Material Type | Blend | | Model | 40001 | | Other Special Features of the Product | Strong | | Part Number | 40001 | | Special Feature | Strong | | Specific Uses For Product | Furniture, Landscaping, Repair, Sink, Wall Repair, Wood, Woodworking | | UPC | 043425400017 | | Unit Count | 16.0 Fluid Ounces | | Viscosity Level | Medium to High | | Volume | 16 Fluid Ounces | | Warranty Description | As Labelled | | Water Resistance Level | Water Resistant | ## Product Details - **Brand:** J-B Weld - **Item Form:** Liquid - **Material:** Blend - **Special Feature:** Strong - **Specific Uses For Product:** Furniture, Landscaping, Repair, Sink, Wall Repair, Wood, Woodworking ## Images ![J-B Weld 40001 Wood Restore Liquid Hardener - 16 oz., Original Version - Image 1](https://m.media-amazon.com/images/I/71gie7WH4hL.jpg) ## Questions & Answers **Q: Will this strengthen the partially rotted tops of 4 x 4 red wood deck posts, fill the rot cavity, and firmly hold screws?** A: I have used this product and Minwax wood hardener. Minwax is the better product. It penetrates deeper and strengthen the wood. I wood follow up with an exterior grade wood filler to fill any rotted out voids then carry on with your fasteners. **Q: how is it applied?** A: I am a fan. However there is no way it can be sprayed on. it's very thick and i can't comprehend it being in a spray bottle. Think honey or syrup. As a handyman profesional I love this. I just did 3 days doing roof trim repair that had rot and carpenter ant damage. The fibers are loose like straw. this firmed them up enough for me to put in wood epoxy. **Q: Chemically, what is this stuff?** A: http://www.jb-weld.co.uk/images/technical-data-sheets/J-B-Weld-MSDS-Wood-Restore-Epoxy1.pdf **Q: Can this be used outdoors?** A: yes it can. I used it on exterior window trim. ## Customer Reviews ### ⭐⭐⭐⭐⭐ This product is a game changer for home repair *by J***Z on May 1, 2026* This product is extremely handy when you have storm damage in your attic. It's also handy for wooden window sills or dormers, where cooling water has caused severe softening. This stuff penetrates deep into softened damaged wood and makes it Rock Solid again. That allows you to use filler and waterproofing materials rather than rip out all of the wood and start over. ### ⭐⭐⭐⭐⭐ This bloody stuff works! Special needs though. *by J***S on December 28, 2023* Had an old set of windows in a very old house. House not worth all new windows due to other problems. Sills were rotted and water would just go down the cracks and fester. Wood was punky or soft and wouldn't keep any paint. Used a similar (but two part) epoxy product in Alaska before and it worked great. Thought I'd try this one part product. I will never go back to a two part system. This product penetrated the compromised wood quite deep down and solidified it. The next day I was able to putty the cracks and low spots and the putty stayed in place tightly. When using an electric dual action sander the putty did not loosen at all. After painting you couldn't tell they were ever damaged. CAUTIONS: Wait till the wood is completely dry. Remove any loose chunks and dust. I used light pressure with a wire brush and vacuumed the debris. In poor weather tarp the area and use an electric hair dryer or heat gun to dry surface quickly. Put putty on after this product, not before. USE GLOVES. Some people could be allergic to uncured product. Also use safety glasses if you are using air to blow out the debris. I prefer to vacuum the debris up instead of blowing them away. Also if the area below the window is one you don't want to leave a permanent unsightly stain on shield the area from drips. Don't pour on thick, often one wet coat will do it. A brush is recommended to get deep penetration into the cracks. One bottle will usually take care of two 36" inch sills or several smaller patches. If in doubt, buy two. If you don't have enough to completely fix a bad spot don't use it at all until you have enough product. Otherwise you will semi-seal up the surface and the new product will not penetrate the surface. I left the patches to dry overnight but if the surface is hard and not tacky after 2-3 hours you could lightly sand if needed and putty could be applied. Don't use heat to accelerate the drying process in the first hour or the penetration will not be as deep. A hair dryer will speed up the process though if the wood was good and dry before treating it with the j-b weld product. Acetone will clean up any dripping but also could affect the finish of the surface you are trying to clean, so the best technique is to mask as needed and watch for drips for the first 5 or 10 minutes. A throw away brush is what I recommend. After trying to clean up a brush I used with this stuff I spent more on acetone than the cost of the brush, let alone the time. Have fun and be prepared to be amazed. ### ⭐⭐⭐⭐ Good Product that worked well for me *by B***Y on August 17, 2015* This stuff worked well to toughen-up a section of rotted wood on my back deck. Area was about 4 feet long, irregular shape and about 4 inches wide and maybe 3/4 inch deep in spots. I chipped away flaky wood and then carefully poured two bottles of the filler along the "wound" over two days. Waited to make sure it sunk in and got " shiny" as the can instructed. It's not magic, but it does make the wood stronger. I then filled in the holes/depressions with a bondo-like product and trowel and painted over that with a tan outdoor paint (low gloss) that kind of matched the natural wood color of the deck. So far (three months) it is holding up well. If you don't stare at the patch it would pass for the original plank. Good product. (Update: After 6 months (over a heavy winter) the epoxy filler I put over the JB Weld separated. More water leaked in so the rot was deeper (maybe 1.5 inches) in a two foot stretch that I had poured the JB Weld in. I still think the Weld was a good product, just asking too much for it to fill a badly rotted section. I'm going to have to replace the board.) ## Frequently Bought Together - J-B Weld 40001 Wood Restore Liquid Hardener - 16 oz., Original Version - Gorilla All Purpose Wood Filler, Natural Finish, 16 Ounce Tub (Pack of 1) - Water Resistant for Indoor or Outdoor Projects and Repairs - J-B Weld 40006 Wood Restore Premium Epoxy Putty Kit - 32 oz. --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/5489514-j-b-weld-40001-wood-restore-liquid-hardener-16-oz](https://www.desertcart.jp/products/5489514-j-b-weld-40001-wood-restore-liquid-hardener-16-oz) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-07-18*