How to Stop A Crack In Wood From Spreading (Detailed Instructions)

When using furniture made from wood such as stairs, large wooden tables, wooden chairs, railings, hardwood floorboards, outside patio boards, the appearance of cracks on the surface is inevitable. The cause may be the wood being worn out after a period of use, due to external forces, or caused by a humid environment. The cracks are unsightly, and sometimes you have to give up your table and chair. That is such a waste!

However, it is not impossible to fix these cracks. All you need to do is follow the simple steps detailed in the article below about how to stop a crack in wood from spreading.

Things You Need Before Stopping A Spreading Wood Crack

A crack in the wood

Once you detect cracks in your wood products, you must quickly take measures to prevent cracks from spreading. Then, all you need to do is identify the crack and follow the steps below to make your wooden furniture like new again.

There are many different ways to repair and prevent cracks in wood from spreading, but in this article, we cover only two primary methods that are easy to follow at home and name the ingredients you need to prepare:

  • Method 1: Using Wood Filler or Wood Epoxy 
  • Method 2: Using Sawdust and Wood Glue

It would be best if you also prepared a protective mask, clothes, and goggles.

2 Methods To Stop A Crack In Wood From Spreading

Although both methods have the same effect on cracks in wood, the materials used are entirely different, depending on the nature of the crack.

  • If the crack is long and thin or medium-size cracks, use Wood Filler or Wood Epoxy.
  • If the crack is shallow and wide, use Sawdust and Wood Glue.

Method 1: Use wood filler or epoxy

Use epoxy putty to fill cracks.

Step 1: Choose ingredients

Choose 1 of 2 materials: wood filler or wood epoxy because these two types cannot be used simultaneously.

First of all, you should know their functions and what they are suitable for specific cases. For example, The liquid epoxy would be an excellent choice for deep cracks because its liquid and viscous nature can help penetrate quickly and deeply into the crack. Wood fillers are also easy to use.

As mentioned in the example, wood epoxy will be used for deep cracks and not tiny see-through cracks to fill the hole. Wood epoxy will create a strong bond with the wood and preventing the crack from expanding further.

Wood fillers are suitable for wood products with wide cracks or missing a few pieces of wood right on their surface. In addition, if you intend to renew the wood surface, you can sand the surface and repaint it to your liking.

Another thing that you should consider is the price because the cost of wood fillers is cheaper than wood epoxy.

Step 2: Get your safety gear

This job will require exposure to chemicals, which can affect your health. So prepare yourself a safety standard gas mask to protect yourself from the epoxides contained in wood epoxy because it is very harmful to your lungs.

You will also need goggles and long-sleeved clothing to prevent chemicals from getting into your eyes and body.

Step 3: Clean the wood

Before treating the crack, the first thing you need to do is clean your wood. You can clean it with regular water or add a little detergent, gently scrub it, rinsing back and forth with water, and let it dry. 

Then clean the remaining debris on the wood surface. This step aims to help the wood surface help epoxy or wood filler adhere to the wood firmly and more aesthetically.

Step 4: Mix and Apply

If you use wood epoxy, this material exists in two forms: liquid and solid. If desired, you can add a little color to enhance the aesthetic of the wood.

Before using epoxy, follow the instructions on the package and mix it in the proper proportions. 

>>> Learn more about how to mix epoxy here.

With wood filler, you do not need to mix; stir well and use it immediately.

Step 5: Let dry

After applying either of the two, let it dry naturally for at least one day. Of the two materials, epoxy dries faster.

>>> Check out another video on how to turn a table with many cracks into a brand new epoxy table: Epoxy Resin River Table

Method 2: Use sawdust and wood glue

Sawdust and wood glue

This method is suitable for cracks that are wide and not too deep.

Step 1: Prepare

Have sawdust and wood glue ready. You can use any sawdust you want. Or, if you want to increase the item’s aesthetics, you can mix more wood chips or new wood to get the best color.

Step 2: Apply

At this step, there are two ways for you to choose:

  • One, fill the crack by applying a layer of glue and sawdust, then glue, then a layer of sawdust.
  • Two, seal the crack with glue and then cover it with sawdust. And make sure the sawdust adheres firmly to the glue.

Step 3: Let It Dry

After covering the crack with sawdust and wood glue, let it dry naturally for at least a day. And then you can continue to repaint your furniture if you want.

Bonus Tips When Fixing A Wood Crack

When dealing with wood cracks, you also need to keep a few things in mind:

  • Always make sure the surface of the treated wood product is dehydrated.
  • Make sure the woods’ surface is also treated clean, with no debris or debris left behind.
  • This work should not be done in a closed room but should choose a well-ventilated and ventilated place.
  • Should choose sunny, dry days to help the glue dry faster, but avoid exposing the product to direct sunlight because it will make the glue dry too quickly if accidentally poured in the wrong place.
  • Always wear protective gear (respirator, goggles, protective clothing) when in contact with hazardous chemicals.
  • Before using epoxy, make sure both resin and hardener are thoroughly mixed.
  • Please ensure the time for the glue to dry completely and then put it into use or continue to apply new paint.
  • If using sawdust, make sure you have the right amount. If you don’t have a lumberyard of your own, then contact lumber mills to get them.


If you are having problems with cracks in your woods and worry about throwing them away, now you don’t need to worry anymore.

As you can see above, there are precisely three methods to help stop a crack in wood from spreading: wood filler, epoxy, and glue with sawdust. Each method has its unique properties for each condition of the wood, and you can do it yourself at home.

If you want to keep your woods longer and limit the appearance of cracks, the best way is to keep them in dry places, avoiding humid places that create favorable conditions for mold growth.