J-B Weld 40001 Wood Restore Liquid Hardener - 16 oz., Original Version

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.

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.

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.

Good product. Works well.

After cleaning old wood, this is the trick for like new wood. The strength of it is J-B weld, and easy to use. Just make sure you have all the prep done before you get to using it, it does dry quick.

This liquid wood restorer prepares rotted wood to accept JB Welld's repair putty. When used together, the rotted wood is brought back to useful life. The putty can then be sanded and painted to match the existing wood. Much better than any wood filler I've ever used. I've been working with wood for almost 3 decades and, in my opinion, JB Weld wood restorer products are the best in the industry.

This stuff is amazing. I wish i knew about it before. So far I’ve used it in two applications. The first was on stained wooden outdoor furniture where the arm of a chair was severely dry rotted. I thought that I would have to get rid of it. I dug out as much of the dry rot that I could and then applied the wood restorer with a small paint brush. It hardened the remaining wood beyond belief. I then filled the hole with Bondo filler that has glass fibers in it. After sanding down, you can’t even see the area where the rot was. The Bondo won’t take the stain. So I painted the arms with an accent color. The results are great. The other application was on the tops of wooden fence posts that have also started to dry rot. After brushing on the wood restorer, the tops hardened right up and are now waterproof. I may not even need to fill in the pitted areas. That’s a job for another day. Note that when using a paint brush to apply this material, be prepared to throw the brush away. It hardens up the bristles and paint thinner won’t remove it.

this works great.

This worked like magic. I used it on the somewhat rotten wood then filled it with putty and painted the wood. It saved the fence and saved a lot of money.

Worked great on my barn door. Really happy with the results.

Had some rotten wood on a railing and didn't want to have to replace it. Used this and it hardened wonderfully. Then filled with 2 part wood epoxy. Worked great

i am very disappointed in this item. it does not dry hard and does not sink into the wood at all. it is absolutely useless for the purpose advertised. amazon does not accept returns on this as it is a 'hazardous' item. so i am out a substantial amount of money.