Does JB Weld Work on Wood? + Uses, Strength, Curing Time

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JB Weld offers the perfect adhesive and fillers to repair and restore wood with the strongest bond possible. But how strong and durable does JB Weld work on wood? Are there any limitations in using it?

Here, I will explain what you need to know and other similar alternatives to look for. Keep reading to find out more!

Is it Recommended to Use J-B Weld on Wood?

JB Weld is ideal for wood repair and restoration outdoors and indoors. It is formulated with a two-component epoxy system using reactive chemistry. The bond from JB Weld has described a cross-woven pattern that gives additional strength, tougher than steel.

It comes in two tubes, 2 oz each, with an easy mixing ratio of 1:1. But there is also a WoodWeld Syringe but a bit more expensive than in tubes.

When used on wood surfaces, it creates an unbreakable bond, and you can also achieve the following qualities of your glued wooden furniture and floorings.

jb weld using on wood

Although this epoxy adhesive can be used on almost all surfaces, you can have better results using JB Weld on the following:

JB Weld can be applied using a roller, brush, spatula, or stick, or you can apply it directly from the tube depending if you use a liquid hardener, syringe, twin tube, or putty JB Weld products.

But to refrain from a messy application, follow the manufacturer’s instructions on the package and use the adhesive primarily on the following:

Aside from those, you can also use JB Weld for sealing leaks in radiators and other cooling system components and repairs in the marine and automotive industries. But, in my experience, JB Weld is reliable in restoring and repairing wood tables and floorings.

using jb weld

How J-B Weld Works on Wood Tables

When it comes to wood table repairs, J-B Weld is my go-to. It does a remarkable job of restoring the table’s original strength, especially when applied correctly.

Last time I had to repair a table leg, the J-B Weld not only bonded it securely but also made the whole structure significantly more impact-resistant. Just remember, it’s essential to fully cure the epoxy; then you can sand away any excess for a smooth finish.

If the area is rotted, remove first the rotted part and apply the JB Weld on the spot. The epoxy filler will extend the lifespan of your table.

How J-B Weld Works on Wood Floors

Have cracks or gaps in your wood flooring? J-B Weld has you covered. I used it to fill in some annoying gaps, and the results speak for themselves. In just an hour, the adhesive fully cured into a glossy, robust coating that’s highly resistant to scratches.

Moreover, this coating provides an additional layer of protection for wooden floorings, making them less vulnerable to damage caused by water splatters and impacts.

Strength of J-B Weld on Wood

JB Weld has a tensile strength of 5020 psi, higher than the previous 3960 psi, with an adhesion strength of 1800 psi. Its tensile lap shear strength is 1040 psi, and its flex strength of 7320.

 After a full curing period—somewhere between 15 to 24 hours—your wood project should be set to withstand extreme temperatures ranging from -67°F to 550°F. I waited about 4 to 6 hours for it to dry completely, and it was worth the patience.

Although JB Weld has promising strength and natural durability, it has limitations on various surfaces. I learned the hard way that it doesn’t adhere well to surfaces like rubber, canvas, and certain types of plastic. If you’re considering using it on these materials, you might want to look for an alternative.

jb weld repairing wood hole

Steps to Using J-B Weld to Restore Your Wood

To restore your wood using JB Weld, you can use the JB Weld Wood Restore Premium Epoxy Putty with its Restore Liquid Hardener, a fast-drying liquid to seal the wood surfaces.

Here are the basic steps to prepare your wood and how to apply and properly cure the epoxy putty and liquid hardener.

Supplies You’ll Need

Step #1: Make sure That the Wood is Dry

Ensure the wood is dry by exposing the wood to sunlight and in an area with proper ventilation. Airflows speeds up the drying of the wood without cracking, but you can also use a heat gun to dry the wood manually.

See Also: Does Sunlight Darken Wood?

If you have seen a few raised grain, debris, or dust, use a tack cloth to remove them from the surface. You should not use soapy water and solutions to clean the surface.

Step #2: Get Rid of the Rotten Parts

To get rid of the rotten parts, use a scraper or screwdriver [1]. Rotten parts include impacted wood fibers, unstable and loose, which should be removed so that JB Weld products can adhere to the surface completely.

cleaning the rotten wood

Step #3: Seal Using the J-B Weld Liquid Hardener

Seal the area using the JB Weld liquid hardener after you remove all the rotted parts. Use a paintbrush to apply a thick layer without missing any spots and achieve a glossy appearance. 

Thick coats on the area provide a strong bond on the surface.

Step #4: Allow it to Dry and Cure

After you apply the liquid hardener, let it dry for 2 – 4 hours and fully cure for about 8 hours. Once the liquid hardener dries, clean the surface using a lint-free cloth.

Step #5: Mix & Prep Your J-B Weld Epoxy Putty

Get your JB Weld Wood Restore Premium Epoxy Putty and mix the two tubes. The mixing ratio should be 1:1 using a stick. Ensure you reach a uniform color, a cream-white hue before you apply it to the area.

Step #6: Now, Apply J-B Weld Epoxy Putty

Once the putty is prepared, apply it immediately using a putty knife to mold, shape, and press to the spots. Using the proper tool in the application makes an even and consistent application. If there is excess putty on the surface, you can remove it using a sharp knife.

The mixed putty will harden immediately after exposure to air for more than 15 minutes.

Step #7: Time to Dry and Cure

Let the epoxy putty dry for at least 2 hours and 16 hours to fully cure, depending on the depth of the spots and the amount of the applied putty. Then sand the surface to smoothen it.

drying after applying jb weld hardener

How Can You Remove J-B Weld from Wood?

You can remove JB Weld from wood using heat or an angle grinder.

To remove it using heat, ensure it is exposed to 600°F (315°C), considered the threshold temperature for epoxy putty. However, this method is challenging because you should not damage your wood while heating the putty to soften it.

You can also use an angle grinder to remove the epoxy putty. With this method, you should not damage the wood underneath.

How Long to Wait Before J-B Weld Dries on Wood?

Normally, the JB Weld dries on wood for at least 2 – 4 hours. However, the drying time depends on the environmental conditions. The higher the humidity, the faster the wood dries.

J-BWeld’s Curing Time

To fully cure the JB Weld, place it in a dry and warm area for at least 7 – 8 hours for Liquid Hardener and a minimum of 16 hours for Premium Epoxy Putty. The wood should not be exposed to water and dirt until fully cured.

Reasons Why JB-Weld Won’t Stick on Wooden Surfaces

It’s true, there are times when JB Weld didn’t adhere well to my wooden projects. The main culprits? Wet and rotten wood. Impacted, loose, and unstable wood fibers hinder the adhesive from coming to stick on the surface. Also, dust, debris, dirt, and paint residue prevent the penetration of the glue into the wood. 

I learned quickly that prepping the wood adequately is a non-negotiable step if you’re looking to achieve optimal results with JB Weld, especially for restoring tables and flooring.

drilling wood with jb weld

Strength of J-B Weld vs Epoxy

Although it is a variety of epoxy resin, JB Weld has an adhesion strength of 1800 psi, making it resistant to heat without shrinking. It is one of the epoxies that offers the strongest bond between wood fibers and other surfaces.

Also Read: Is Epoxy Resin Food-Safe

Primarily, epoxy provides a permanent bond and additional strength. But with JB Weld epoxy, the adhesion strength can quickly bond metal together, repair boats, and other easier fixing surfaces.

J-B Weld Strength vs Welding

When applied correctly, I’ve found that JB Weld can actually be just as strong as steel. I’ve successfully used it in place of traditional welding materials to bind together cast iron parts, and it’s held up remarkably well. That said, I have to acknowledge that traditional welded joints, being made of steel, have an inherent edge in strength. Still, for certain applications, JB Weld offers a very reliable and durable alternative to welding.

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JB Weld does work on wood well, but you need to make sure that the surface is completely dry and properly prepared. The epoxy putty with liquid hardener makes it work on different wood species.

You can follow this step-by-step guide to use JB Weld wood products properly for the repair and restoration of your wooden tables and floorings and more.

Robert Johnson is a passionate furniture maker & carpenter, sought after for his knowledge on the craft.
You've probably seen his down-to-earth wisdom in USA Today, Bobvila, Family Handyman, and The Spruce, where he has shared commentary and guidance on various woodworking topics.

Robert is the brain behind Sawinery, where he aims to share tips, tricks, and a passion for all things carpentry.
Robert Johnson

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