How to Make Cardboard Hard Like Wood

Cardboards are generally used for packaging several materials, but it greater usabilities rather than jut a packaging material. Cardboard boxes can be used for several DIY projects, and that’s what makes it special. They are sustainable, and with some simple technique, you can make them as hard as wood. This means you can make almost anything you want when you have to get your cardboards partially or appropriately hard like wood. It will allow you to make some lightweight furniture in a cost-effective way. Whether or not, there are several other aspects for which you are gonna need them turned hard as wood, and I am going to waste any time discussing the possibilities. So, leave all those things, and let’s see how to make cardboard hard like wood?

How to Make Cardboard Hard Like Wood 1

Before I learned about the usage of cardboards, I always thought they are useless material or can only be used for packaging purposes. So, whenever I moved from one place to another or bought some new items, I gathered the cardboards and sold them at a certain period of time. But once I thought, why not use them rather than just throwing them or selling them out. I also searched like you and gathered some wonderful ideas about using these items. For this article, particularly, I have chosen to show you how to make cardboard hard like wood.

Things You Will Need

  • PVA glue
  • Brush
  • Polyester resin
  • Plastic Cups
  • Safety goggles
  • Newspaper
  • Silicone mat
  • Rubber Gloves
  • Safety Mask
  • Resin Catalyst


Grafix Medium Weight Chipboard Sheets

Cricut Heavy Chipboard

Corrugated Cardboard Sheets


Grafix Medium Weight Chipboard Sheets, 12-Inch by 12-Inch, Natural
Cricut Heavy Chipboard, Brown, Pack of 5
Corrugated Cardboard ,Kraft Brown,


Acid-free design

Perfect for 3d Crafts

Corrugated Pads





Number of Items

25 sheets

5 sheets

50 Sheets


How to Make Cardboard Hard Like Wood

First of all, you have to apply a glue coat on the surface of the cardboard. So, follow the steps below for doing that accurately.

Step 1

Take the PVA glue and mix it’s one part with one part of water. Now, choose your work area and spread a newspaper around it.

PVA Glue

Step 2

Place the cardboard on the newspaper that you have placed earlier and then start applying the mixture to the cardboard surface. Once you complete this process, let the cardboard dry properly. Leave it for two hours at least; it will become dry within that time.

Step 3

If the first layer has dried out, you have to now apply the second layer on the cardboard’s surface. Don’t hurry while you apply this coat on the cardboard surface; take your time, and do it thoroughly. Make sure to apply the coat to the underside and inside of your cardboard. Once you complete applying the PVC glue, leave it dry again.

Cardboard Layer

Step 4

Now, you have to mix the glue again, but the ratio of glue and water will change now. In this step, you have to take two parts of the glue and mix it into one part of the water.

Step 5

Next, you have to apply the third coat with this more PVC mixture. Like always, when you will complete, you have to give the required time to dry properly. While doing this, you will notice that your cardboard is taking a shiny plastic-like appearance. That’s the sign; you are heading towards the right place.

Step 6

After that, you have to create another mixture of PVC glue. Don’t get annoyed; it is all about the game of glue. The more glue you will apply, the harder your cardboard will become. But you have to maintain consistency; otherwise, the entire project can get ruin. You have to focus on the bottom and interior parts of your cardboard when you are applying the fourth layer of PVC.

Step 7

This is time to end up the process. I mean, you have to apply the final coat of PVC glue. Make another mixture of glue by maintaining the ratio of 2:1 and then apply all of them on the surface of the project. When this final coat dries, your cardboard will become harder than before.

Okay, now you have to focus on applying a fiberglass resin coat. So, let’s see how you will do that.

Step 1

For this purpose, you have to choose your workspace in a well-ventilated area. Like the previous method, spread a newspaper on the floor so that your floor doesn’t get damaged during the process. After that, place the silicone mat and place your cardboard on that mat. As the cardboard has become hardened, it won’t stick with the silicone mat. By the way, make sure to wear safety glasses and gloves during this process.

Step 2

Now, take the polyester resin and mix it up with the catalyst. The amount of this mixture depends on your cardboard’s size, so use your eyeballs to ensure the perfect amount. Allow 17 minutes to set resin properly. I will recommend you to mix a little amount at the initial stage and then mix more if needed.

Take Polyester Resin and Mix It

Step 3

Once you have finished mixing the resin, take a brush, and start applying the resin to your cardboard’s surface. In this case, you may have to accomplish the process in two parts because you won’t be able to apply the mixture on both sides at the same time. So, finish the front side first and then start working with the bottom side. Make sure to apply enough resin so that no space remains empty.

Applying the Resin

Step 4

After applying the resin on the entire surface, you have to leave it for 24 hours to let it set properly. Once it is dry, you have to apply another layer of resin on the surface and then leave it for another 24 hours drying process. That’s it; your cardboards will now become hard as woods.

Final Thoughts

Hopefully, the above process is going to be way more helpful for you, and you won’t have to ask anyone how to make cardboard hard like wood. If you are still confused or got something more enhanced, let me know through the comment section.

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