Does Flex Glue Work On Wood? Let’s Experience Its Shocking Results

Flex Glue

It is always a hassle to buy new adhesives every time we ‘accidentally’ break a chair or our mom’s favorite decoration piece. Living in such a rush, Flex seal has made it easier for us by coming up with their newest product, Flex glue. Many adhesives work great on most materials, but one; Wood. So the question is, Does flex glue work on wood?

Yes, it does! Along with that, it can also fix your cracked tiles or mirror. Flex glue is a multipurpose adhesive that can work on any surface. It has instant grab-and-hold capabilities to ensure the surface does not slip away from its place while the glue is curing it.

I am sure, just like I was, you must also be curious about this magical glue. To my knowledge, there hasn’t been any product that could cure surfaces in and out of water. Let’s explore the secret of flex glue!

Flex glue: what is it, and Its key ingredients?

Flex glue is a waterproof adhesive and its uses are many. It works great on many.

The most shocking fact is that flex glue is waterproof and works underwater! The reason behind it is that it is solvent-free and traps water and air.

Key ingredients of Flex Glue formulation:

Flex glue is essentially an epoxy adhesive. It is made up of a synthetic mixture of resin or epoxy polymer. Besides these, a hardening agent is a plus in this glue that helps it to attach to a wide range of surfaces.

It creates a strong and durable bond that is thermosetting resilient. It can withstand harsh environmental conditions, high pressure, and extreme stress.

Does flex glue work on wood? Then how does it works?

Yes, Flex glue works wonderfully on wood. It is water-resistant, paintable, and penetrable, which makes it easier to apply to wood. Epoxy in the flex glue makes it penetrable; hence it reaches the ridges of the wood fibers. This deeper penetration allows for a stronger bond between wood pieces.

Despite its strength, some users find it to be weaker in comparison with its alternatives. These users appreciate the durability of flex glue underwater and say they would use this glue in a damp or humid environment. For the most part, epoxy makes the flex glue water-resistant and easy to cure underwater.

Flex glue also works well as a top coat for wood pieces. Since it adheres to wood easily and is water resistant, it keeps the wood safe. It can be poured over table tops for a water-resistant finish and to fill up any cracks on the top.

The only downside of using flex glue on wood is that it slowly breaks down under Ultra-Violet (UV) radiation. Prolonged exposure to the sun might weaken the bond.

You can still use flex glue for wood surfaces in the dark or apply a UV blocker coat on top of it to protect this glue and reap its benefits.

How to use flex glue? Step-By-Step Guideline

Flex Glue On Wood

Flex glue comes in two packaging: squeeze tube and clear cartridge. Squeeze tube, which comes in 4 oz and 6 oz, is very easy to use and can be used for small cracks.

The clear cartridge comes in 9 oz, 10, and 28oz sizes. To use a cartridge, you would require a caulk gun. A caulk gun is a special tool that holds the cartridge for gaps and cracks.

Step-by-step process of flex glue

Step 1: Clean the surface you want to bond thoroughly. Make sure there are no dust particles or oil residue on the surface.

Step 2: Remove the nozzle from the tube and cut off the tip, avoiding the thread. Then put the nozzle back on and cut just enough tip so the glue can ooze out of it.

Step 3: Apply the glue on the desired surface in a moderate amount.

Step 4: Apply pressure on the bonded surfaces for 10 to 30 seconds to fix them in their place

Step 5: If you want to move the surface from the place, you can.

Step 6: After a week, your surface is set to be used again.

Note: Flex glue does not crack but can not be removed without damaging the surface once cured.

Pros and cons of flex glue:

As we know, nothing, and there are always pros with cons of any product. Now, the question is whether the product is more damaging than beneficial. Let’s find out:


  • Super strong and can virtually repair anything.
  • Thick adhesive works on dry and wet surfaces.
  • Pro formula and Instant grab properties hold the object.
  • UV resistant.


  • The tip of the nozzle hardens after use.
  • Takes time to dry off.
  • Cause the paint to loosen is used on top of it.
  • Hard to squeeze the tube without proper equipment; a caulk gun.

Can Flex Glue be removed from wood?

Flex Glue Removed From Wood

You can clean flex glue with a dry cloth before it cures. With that acetone and isopropyl, an acid plays a vital role in removing any residue.

But it is important to remember that once it cures, it can be very hard to remove without damaging the surface. Still, if you prefer, you can scrape off the glue with a sharp tool like a chisel.

What’s the difference between Flex Glue and Flex Seal?

Flex Seal: An Overview

Flex Seal comes in two forms; spray and liquid. Essentially, liquid rubber seeps into cracks and holes, leaving behind a watertight, flexible rubberized coating.

Flex seal is easy to use as you don’t need any extra equipment, whereas flex seal liquid has versatile usage as you can brush, roll, dip, or pour.

Flex glue: An Overview

While Flex glue is also easy to use and just as strong as flex seal, it has unique properties.

To start, it is a waterproof adhesive that is solvent free and has instant grab-and-hold capabilities.

Flex glue is specially formulated to work on all types of surfaces and underwater.

How long for flex seal glue to dry?

The time frame in which you can replace and reposition the bonded surfaces is approximately 10 minutes from when you apply the glue.

After that, you will find it cured enough to try to manipulate it. From then, it takes a week for the glue to cure fully. Rest assured, your object will be all set to use again.

How long does Flex Glue last on wood?

Flex seal, once cured fully, can keep your object together for up to 30 years. Crack-free, it can not be affected by any harsh environment.

Flex glue on wood, like furniture and frames, can last longer. The reason is that less tensile force is applied to the object.

Is flex glue toxic?

Adhesives like flex glue are from strong chemicals and their fumes can cause health issues. Flex glue contains acrylate and latex, commonly used in adhesives, and can cause an allergic skin reaction.

Please don’t forget to wear gloves and safety glasses when using flex glue. You should strictly keep it out of reach of children. If it comes in contact with the eyes and skin, seek medical help immediately.


Does Flex Glue come in black? Is it getting hard?

Unfortunately, no. Flex glue comes in clear and white form, but it is paintable!
Once it is cured, it turns into a crystal-clear bond. It gets hard but not dry.

Does Flex Glue Bond Instantly? How Much Weight Will It Hold?

Flex glue takes about a week to cure completely, and you can use your fixed surface. Flex glue can hold up to 1000 pounds.

Can Flex Glue be painted?

Flex glue is paintable and can be used on any surface! You don’t have to worry about it standing out from the surface.


Calling a professional for small things is a hassle and unnecessarily expensive. Imagine having to call a carpenter because a shelf broke, but imagine being able to fix it yourself easily.

This glue is not only super strong but also works on various surfaces. All you have to do is apply it and hold it how you want it to be.

Fixing things on the go has never been easier, and the finish is perfect too. If you want to save time and money like this, I recommend flex glue. But more than just taking my word for it, I hope this article helped you make your decision and answered all your questions.

About Adam Larry

Hello everyone! I’m Adam Larry, a pro woodworker, an expert project planner, and woodworking tools expert also owner of this website. From hand tools to power tools, I have extensive knowledge of all aspects of woodworking and take pride in creating beautiful and functional pieces for clients. I feel glad to share my woodworking experience with you with enormous excitement and enthusiasm.

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