How to Waterproof an Outdoor Storage Box in 5 Simple Steps

Keeping your outdoor storage box safe and dry is a constant challenge. You want to protect the items inside but don’t know how to waterproof them effectively.

Traditional methods of waterproofing can be time-consuming, expensive, and unreliable. Plus, they often require special tools or materials that are hard to find or use. 

How to Waterproof an Outdoor Storage Box

We understand your frustration, so we’ve developed an easy-to-follow guide on how to waterproof an outdoor storage box quickly and easily! 

Our thoroughly researched step-by-step instructions will help you keep your belongings safe from water damage for years. 

Trust us when we say waterproofing an outdoor storage box doesn’t have to be a hassle. 

Follow along, and you’ll see just how simple it can be! 

5 Reasons Why Waterproof an Outdoor Storage Box?

1. To prevent water damage to stored items.

Storing items in a waterproof box ensures they are safe from water and moisture, which can cause mold or mildew buildup and damage the items inside.

If your items are not waterproof, you will find that unprotected items can become discolored and brittle when exposed to the elements.

It can also help protect items from pests, such as mice or insects, that can damage the contents of an unprotected box.

2. Make your box last longer.

Waterproofing your outdoor storage box will help ensure that it can withstand harsh weather conditions for longer.

This is especially important if you live in an area with extreme temperatures or frequent storms. Without waterproofing, the box could be damaged and not last as long as you would hope.

3. To keep the box looking nice.

The exterior of a storage box can become worn and fade over time, especially when exposed to the elements. Waterproofing your outdoor storage box will help to preserve its look and add some protection against fading or discoloration due to sun exposure.

If your box is treated with a waterproof coating, it will also help to prevent unsightly mold and mildew growth.

4. To protect against corrosion or rust.

If your outdoor storage box is made of metal, then waterproofing can help protect against corrosion and rust. This is especially important if your box is exposed to moisture for extended periods.

To Protect Against Corrosion or Rust

A waterproof coating will help to keep rust at bay and preserve the appearance of your box for longer.

5. To protect your belongings from pests and rodents.

An outdoor storage box can become an ideal home for pests, such as mice or other rodents. If your items are stored unprotected, they could be damaged by pests.

Waterproofing your box will help make it less attractive and reduce the risk of pests entering. It will also protect your stored items from damage caused by pests. 

Once you understand the importance of waterproofing an outdoor storage box, it’s time to learn how to do it. 

Required Supplies & Materials:

  •  Waterproof sealant or paint
  •  Paintbrush or foam brush
  •  Sandpaper
  •  Masking tape
  •  Drop cloths (optional)

Instructions: How to Waterproof an Outdoor Storage Box

Step 1. Prepare the surface:

Use sandpaper to roughen up the surface and remove any dirt, dust, or debris that may be present. Check if any gaps, cracks, or holes in the box need to be filled with a waterproof filler. Once you’ve prepared the surface, use masking tape to cover all areas you don’t want to be painted.

Step 2. Prepare the box:

Lay down drop cloths or a tarp to protect the surface underneath the box from paint or sealant. Make sure that all surfaces of the box are clean and dry before you begin to apply the waterproofing. If your box is made of wood, use a weatherproof primer before applying the sealant or paint.

Step 3. Applying the sealant:

Apply the waterproof sealant or paint to the entire box surface using a brush or foam brush. Allow it to dry, and then apply a second coat for extra protection. Make sure that you cover every area, including all corners and edges. 

Applying the Sealant

Step 4. Apply Painting or Staining:

If you want to add color to your box, use a sealant containing paint or apply the desired paint color. Allow it to dry, and then apply a finishing topcoat for extra protection. If you’re not going to paint your box, you can also use a waterproof stain to give it a more natural look.

Step 5. Let the box dry: 

Let your waterproofed outdoor storage box dry for at least 24 hours before using it. This will ensure that the sealant or paint is fully cured and can withstand any weather conditions. 

If your box needs to be moved, don’t damage the waterproofing. Once it’s in place, enjoy your weatherproof storage box for years! 

Once your box is waterproofed, you can store your items outdoors without worrying about them being damaged by moisture or pests. Enjoy the peace of mind of knowing that your belongings are safe and secure! 

Few Tips While Building Waterproof Outdoor Storage Boxes:

1. Use waterproof sealant or paint on all surfaces, including the corners and edges.

2. Use drop cloths or plastic sheets when painting or staining the box to prevent water from seeping in.

3. Choose durable materials for construction, like marine-grade plywood, pressure-treated wood, and stainless steel hardware.

4. Use sealant along all of the seams and joints to ensure a tight fit.

5. If using screws, use stainless steel screws with neoprene washers to help prevent water from leaking in.

6. Add drainage holes on the bottom of the box and a vent on the top to reduce moisture buildup inside.

7. For extra protection, consider adding a coat of polyurethane sealant or another waterproof material to the outside of the box.

8. Store your waterproof outdoor storage box in a sheltered area away from direct sunlight, rain, and snow. This will help keep the storage box in good condition for a longer time. 

Outdoor Storage Box Waterproofing Techniques for Different Materials

There are several different methods available, depending on the material and size of your box. Here are a few of the most popular waterproofing techniques:

Wooden Outdoor Storage Box:

When waterproofing a wooden box, start by sanding the surfaces and applying a high-quality sealant. Once the sealant is dry, apply two coats of paint or varnish to ensure no water can penetrate it.

Wooden Outdoor Storage Box

To further protect your wooden outdoor storage box, you may want to consider adding a layer of polyurethane sealant once the paint or varnish has dried.

Metal Outdoor Storage Box:

When waterproofing a metal box, clean it thoroughly with soap and water to remove any dirt or grime that could interfere with the waterproofing process.

Once the box is dry, apply a rust-inhibiting primer to protect the metal from rust and corrosion. Once the primer has dried, apply a waterproof sealant to prevent water from entering the box.

To further protect your metal outdoor storage box, you may want to consider adding a layer of plastic sheeting around the edges to ensure that no moisture can get through any crevices.

Plastic Outdoor Storage Box:

Plastic outdoor storage boxes already have a waterproof coating, so you will not need to waterproof them. However, you may want to consider cleaning it regularly to remove any dirt or grime that could interfere with the box’s ability to keep out moisture. 

You may also want to add a sealant around joints or seams to ensure complete waterproofing. It is also important to check the box regularly for cracks, holes, or other damage that could let in moisture. If you find any of these issues, repair them yourself or have a professional do it. 

Wicker Outdoor Storage Box:

When waterproofing a wicker outdoor storage box, start by sanding the surfaces and using a brush to remove any dust or dirt. Once the box is clean, apply a sealant designed for outdoor use. 

When applying the sealant, cover all areas of the box, including seams and joints.

Wicker Outdoor Storage Box

Additionally, you may consider applying a topcoat of paint or varnish once the sealant has dried. This will provide an extra protective layer against moisture and help keep your wicker outdoor storage box in good condition for years. 

So, no matter what outdoor storage box you have, several techniques can be used to ensure waterproofing.

By following the appropriate techniques for your material and the size of the storage box, you can ensure that your items will stay dry and protected, regardless of the weather. 

Keep This Things in Mind for Waterproofing Outdoor Storage Box:

1. Use Cover for Outdoor Storage Box: 

Use a cover for your outdoor storage box to protect it from the elements. A cover will keep out water, dust, and debris while keeping in the warmth of the sun’s rays.

You can also add a cushion to the bottom of the box for extra protection against cold and dampness. Consider purchasing a waterproof cover if your storage box is exposed to the elements and needs extra protection.

2. Use Sealants: 

Sealants are widely available in most home improvement stores and can be applied to create a water-resistant barrier around your outdoor storage box.

Choose a sealant that’s specifically designed for wood or metal, depending on your box material. Make sure to follow the manufacturer’s instructions for best results.

3. Avoid Putting the Box Directly on the Ground: 

Water can accumulate in your outdoor storage box, so keeping it off the ground is important. If you have a wooden storage box, consider putting it on blocks or rails to prevent water from seeping into the wood.

Avoid Putting the Box Directly on the Ground

For metal boxes, use flat boards or pavers to create an elevated platform that prevents water from pooling around the box.

4. Check for Leaks: 

Regularly inspect your outdoor storage box for any visible signs of leaks or damage. Look for cracks, splits, and holes that can let in moisture and cause rot or rust to your materials. If you find any damage, repair it immediately to prevent further water intrusion.

5. Line the Interior: 

To further protect your items from moisture, consider lining the interior of your outdoor storage box with a plastic sheet or tarp. This will help keep the contents dry and prevent mold growth, which can cause damage to your stored items.

Check the liner regularly for any rips or tears that could lead to water intrusion. Make sure your liner fits snugly in the box to provide an extra seal of protection against water.

6. Keep Your Box in a Sheltered Spot: 

Where you place your outdoor storage box can make a huge difference in the amount of water and moisture that gets inside. 

Avoid placing the box near a body of water or in an area where it will be exposed to heavy rainfall or snowfall. If possible, look for a sheltered spot under an overhang or against a wall to keep it safe from the elements.

Waterproofing your outdoor storage box is important to keep its contents dry and protected from moisture damage. Follow these simple tips to keep your items safe and secure in any weather. 

Frequently Asked Questions:

How do you cover outdoor boxes in the rain?

The best way to cover outdoor boxes in the rain is with a waterproof tarp or cover. The material should be breathable, allow air circulation, and be strong enough to withstand heavy winds and rain.

You may also consider adding a waterproof sealant between the box and the cover for extra protection against moisture. 

If you use a plastic box, you may want to line the interior with a tarp or plastic sheet to protect against rain and moisture. Secure the cover tightly around your box to stay put in case of high winds.

Additionally, you should check your boxes regularly for any signs of water damage. If necessary, tighten the cover and check for any gaps or areas where water may enter. 

What’s the best way to store outdoor cushions?

The best way to store outdoor cushions is in a dry, well-ventilated area. Ideally, this should be an indoor space such as a shed or garage with consistent temperature and humidity.

It is important to keep your cushions away from direct sunlight to avoid discoloration and damage due to UV rays. Additionally, you should clean and dry your cushions before storing them away.

This will help prevent the growth of mold or mildew in damp conditions. Store your cushions in a waterproof container with a lid to ensure they stay dry. 

How do you waterproof the inside of a wooden storage box?

The best way to waterproof the inside of a wooden storage box is with a sealant. You can use either a brush-on or spray-on sealant for this purpose. Apply an even coat over all surfaces, including edges and cracks.

Allow the sealant to dry completely before putting any items inside the box. You can also line the interior with a plastic sheet to further protect against moisture. This should help keep your items dry in case of any accidental water leaks. 

How do you make a waterproof lid?

The best way to make a waterproof lid is to use a naturally water-resistant material. Common materials used for waterproof lids include silicone, rubber, plastic, or metal.

You can also opt for specially designed sealants or gaskets to create an airtight environment around the lid. When choosing which material to use, consider the environmental conditions it may be exposed to, such as extreme temperatures or moisture.

You must combine two or more materials to ensure a tight seal and maximum waterproofing. Also, make sure to test the lid for any air gaps or leaks before using it. 

In Closing

Waterproofing your outdoor storage box is essential to protecting it from the elements and keeping its contents dry. 

By using a cover, and sealants, lining the interior with plastic or a tarp, and placing it in a sheltered spot, you can ensure that your items are safe and secure regardless of the weather. 

Now that you know how to waterproof an outdoor storage box, why not take this knowledge one step further by implementing it yourself?

If you enjoyed reading this article, please consider sharing it with others who may find it helpful. 

Also, visit our other blog post for more tips to make sure all of your belongings stay protected!

Related Articles:

Leave a Comment