---
product_id: 5489514
title: "40001 Wood Restore Liquid Hardener - 16 oz., Original Version"
brand: "j-b weld"
price: "€ 48.20"
currency: EUR
in_stock: true
reviews_count: 12
category: "J B Weld"
url: https://www.desertcart.ie/products/5489514-40001-wood-restore-liquid-hardener-16-oz-original-version
store_origin: IE
region: Ireland
---

# Moisture sealing & reduction Deep wood fiber penetration Quick drying in hours 40001 Wood Restore Liquid Hardener - 16 oz., Original Version

**Brand:** j-b weld
**Price:** € 48.20
**Availability:** ✅ In Stock

## Summary

> 🛠️ Restore, Reinforce, Repeat — The Pro’s Secret to Wood That Lasts

## Quick Answers

- **What is this?** 40001 Wood Restore Liquid Hardener - 16 oz., Original Version by j-b weld
- **How much does it cost?** € 48.20 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/5489514-40001-wood-restore-liquid-hardener-16-oz-original-version)

## 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

- • **One-Step Application:** No mixing required—easy brush-on liquid formula for professional-grade results.
- • **Pro-Grade Durability:** Creates a rock-solid base that holds wood fillers and putties firmly, even under stress.
- • **Fast-Acting Wood Savior:** Seals and reinforces rotted wood in just hours, saving your project time and hassle.
- • **Moisture Barrier Master:** Effectively reduces moisture in compromised wood, preventing further decay and damage.
- • **Versatile Restoration Power:** Perfect for windows, doors, fences, antique furniture, and more—no job too big or small.

## Overview

J-B Weld 40001 Wood Restore Liquid Hardener is a quick-drying, one-component liquid designed to penetrate and reinforce decayed or rotted wood. It seals moisture, halts further wood decay, and provides a durable base for wood fillers and putties. Trusted by professionals, this medium-viscosity formula is ideal for restoring wood surfaces on doors, windows, fences, and antique furniture, delivering long-lasting strength and water resistance.

## 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 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.
Review: Hard Enough For Screws. - I wasn't convinced this could do the job, but I was happily surprised. Worked great on the wood rot on my railing. It was a two by four, and it had rotted out because of what must have been a split in the wood and a hard working carpenter bee. It made the wood hard enough, with several coats, so that it would accommodate these various wood screws (see pic). I think it created a great base for the wood putty as well. Remember, the first few coats will take longer to penetrate and dry, after that, it goes pretty fast. Took eight coats, but it did the job. Also, a little goes a long way. I almost have a full bottle left. Should be sufficient for any project. It's a buy.

## 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 | #44,113 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #45 in Wood Glue |
| Brand | J-B Weld |
| Color | Clear to Amber |
| Date First Available | June 4, 2011 |
| Global Trade Identification Number | 00043425400017 |
| Item Form | Liquid |
| Item Package Quantity | 1 |
| Item Volume | 16 Fluid Ounces |
| Item Weight | 1 pounds |
| Item model number | 40001 |
| Manufacturer | JBWeld |
| Material | Blend |
| Package Information | Bottle |
| Product Dimensions | 2 x 4 x 7 inches |
| Special Feature | Strong |
| Specific Uses For Product | Furniture, Landscaping, Repair, Sink, Wall Repair, Wood, Woodworking |
| UPC | 043425400017 |
| Unit Count | 16.0 Fluid Ounces |
| Viscosity | Medium |
| Viscosity Level | Medium to High |
| 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

![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 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.

### ⭐⭐⭐⭐⭐ Hard Enough For Screws.
*by T***B on July 20, 2025*

I wasn't convinced this could do the job, but I was happily surprised. Worked great on the wood rot on my railing. It was a two by four, and it had rotted out because of what must have been a split in the wood and a hard working carpenter bee. It made the wood hard enough, with several coats, so that it would accommodate these various wood screws (see pic). I think it created a great base for the wood putty as well. Remember, the first few coats will take longer to penetrate and dry, after that, it goes pretty fast. Took eight coats, but it did the job. Also, a little goes a long way. I almost have a full bottle left. Should be sufficient for any project. It's a buy.

### ⭐⭐⭐⭐ J-B Weld Wood Restorer
*by B***O on March 17, 2023*

I bought this wood restorer because I found a joist under by wooden deck has some major rotted places. I slid a "sister joist" in place beside the deteriorating joist to take on the support, but left the old joist in place due to the hassle of trying to remove it. I used the J-B Weld Wood Restore on the bad spots of the weakened beam. The product is a fairly thickened, whiteish, liquid that you paint on with a brush. I put it on with a paint brush, and used two coats, letting it dry in between. Honestly, I'm not sure if it will "strengthen" any wood rot, but, it did seem to soak in, and, it seemed more like a "hardened semi plastic" paint than anything else. It seems like it would stop any water penetration where it is used, which is what happened in my case, due to water sitting and soaking into the joist timber over a thirty plus year lifetime of the deck. I do recommend the product, but not as a "rotted wood restorer", but as a semi plastic, wood treatment, with a glossy, clear finish that should repel any further water soaking into your deck wood.

## 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.

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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-03-15*