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How to Make a Waterproof Box?

How to Make a Waterproof Box?

Do you want to learn how to make a waterproof box? If you’re an avid gardener, or just like to be prepared for any circumstance, then this growing guide is for you! In this article, we will answer common questions about how to make a watertight container. We’ll provide helpful tips and advice on what materials to use and how to assemble your new box. So whether you’re looking for a way to protect your seeds from the rain or simply need a storage container that won’t leak, read on for all the information you need!

Different Materials of Boxes

There are many reasons why you might want to waterproof a box. Maybe you’re growing plants indoors and need to keep the soil moist, or maybe you’re taking your fishing gear on a trip and don’t want it to get wet. It could be even because you want to assure your belongings will be transported safely. No matter what your reason is, learning how to make a waterproof box is a handy skill to have.

Different Materials of Boxes

There are many types of materials that can be used to make a waterproof box. The most popular are made out of plastic, metal, or wood.

The type of material used will determine the strength and durability of the box. It is important to choose a material that will not easily break or corrode when exposed to water.

Plastic boxes are lightweight and inexpensive but they may not be as strong as other materials. Metal boxes are more durable but can be heavier than plastic or wooden boxes. Wooden boxes are the most expensive option but they are also the strongest and most durable option.

Cardboard boxes should not be used to store or transport water-sensitive items but if you have the need for it, you can waterproof them as well, although it won’t be nearly as effective as for other types of boxes. [1]

Can You Make Any Box Waterproof?

It is possible to make any type of box waterproof. However, the level of water resistance may vary depending on the material used. A wooden box is a perfect choice for garden work, as it is strong and robust but will not stand up to soaking and remain watertight. Hence waterproofing is important. Let’s look at some of the most common methods to waterproof your box.

Making a Waterproof Wooden Box

First, you need to decide on the size of the box. The sides of the box should be at least an inch thick to provide enough strength and durability. When it comes to dimensions, it’s all up to your needs.

Once you have decided on the sizes of the box, use a saw to cut the pieces out of lumber. You can use any type of wood for your future box.

Making a Waterproof Wooden Box

After cutting the pieces of wood, sand the edges of each one until they are smooth. This will help to prevent any injuries down the road and will help the sealant to adhere better.

The next step is attaching the pieces together with waterproof glue or silicone caulk. You need to attach the longer walls to the shorter walls. Make sure the pieces are aligned correctly before gluing them together and leave the box to dry. The drying time depends on a lot of factors and sometimes can take up to 24 hours.

After the walls have been glued together, it’s time to secure them even further with braces and some screws. Use the brace for each corner of your box and screw it into place. This will ensure that the walls don’t move and that the box is completely waterproof.

If you want your box to have a lid, the next step is to create it. Cut a piece of wood that is the same size as the top of your box. Measure where you want hinges to be located, screw them in place, and then attach the lid to the box.

Now that your box is complete, it’s time to waterproof it for good. Apply a sealant or paint to all of the boxes’ external surfaces. This will help keep the water out and your items safe and dry. One of the best sealant choices for water protection is varnish. [1], [2], [3]

Making Cardboard Box Waterproof

Yes, it is possible to make a cardboard box waterproof. It’s quite easy and doesn’t require any special materials or tools. It won’t offer 100% protection. We mind you, but it will reduce the moisture infiltration significantly.

So, let’s see how to do it!

By using a PVA glue

The most basic and easy way to make a cardboard box waterproof is by using a PVA glue. All you need to do is apply a good layer of one part glue mixed with one part water on all the seams and joints of the box, making sure to seal them properly. After the glue dries off, prepare a second layer of the mixture and leave it to dry again. Now, apply a third layer but this time with 2 part glue and 1 part water.

By using a PVA glue

This method should keep the moisture away and your box waterproof for a while, but it’s not permanent. If you want to make it more durable, you can use the other methods below. [4], [5]

By using a protective coating

Another way to waterproof your cardboard box is by using a protective coating.

Avoid using polyurethane on cardboard boxes as it doesn’t work that well on cardboard surface and may even damage it.

Shellac is a to-go choice for all non-wooden surfaces. It can be applied with a brush, and it will dry quickly.

The other type of coating you can use is waterproof acrylic paint. It can be sprayed or applied with a brush, and it dries quickly as well. However, it will make your box a bit heavier, so keep that in mind.

Either of these methods should provide good results and keep your box waterproof for a longer period of time. [4], [5]


How do you make a plastic box waterproof?

There are a few ways to make a plastic box waterproof. One way is to use a sealant such as silicone caulk. Another way is to use hot glue. Finally, you can use duct tape. All of these methods will create a watertight seal between the box and the lid.

Can you make a wooden box waterproof?

Yes, you can make a wooden box waterproof by using a sealant or paint. Make sure to coat all the surfaces of the wood, and allow enough time for it to dry before using.

How do you seal plastic containers at home?

There are a few ways to seal plastic containers at home. The simplest way is to use a silicone sealant or adhesive. You can also use clamps or screws to hold the container together.

If you are using a sealant or adhesive, make sure that it is food-safe and waterproof. Make sure that the edges of the container are clean and dry before applying the sealant. Apply an even coat of sealant, and let it dry completely before using the container.

If you are using clamps or screws, make sure that they are tight enough to keep the water out. Do not overtighten them, as this could damage the container.

Useful Video: How to Waterproof Anything With Fiberglass


If you want to make sure that your belongings stay dry and protected from the elements, it’s important to waterproof your box. Luckily, this is a process that can be done with ease, regardless of the type of box you have. Usually, a few layers of waterproof coating or sealing the seams with caulk is enough.

Even cardboard boxes can be protected – just not as effective if you’re in need of some sturdy boxes that will keep your possessions from getting wet, follow the tips we’ve covered!


  1. https://goneoutdoors.com/build-waterproof-box-12118977.html
  2. https://www.doityourself.com/stry/how-to-build-waterproof-pool-deck-boxes-for-storage
  3. https://bestdeckboxes.com/waterproof-wooden-box/
  4. https://safepackaginguk.com/how-to-waterproof-cardboard-boxes/
  5. https://pickypens.com/7-methods-for-waterproofing-cardboard-tested/