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How to Waterproof a Truck Cap?

How to Waterproof a Truck Cap?

If you have a truck cap, you know that it’s important to keep it in good condition. Not only does it protect your truck from the elements, but it also helps keep your cargo safe and secure. One of the most important aspects of maintaining a truck cap is making sure that it is watertight. In this blog post, we will discuss some tips and tricks for waterproofing your truck cap.

What Is A Truck Cap?

A truck cap is a hard covering that goes over the bed of a pickup truck.

They come in handy for a number of reasons, including hauling larger items or providing extra storage space. Truck caps can also be used to protect your truck bed from the elements and keep your belongings dry.

Waterproofing your truck cap is a great way to extend its life and keep it looking good for years to come. [1]

What Is A Truck Cap?

Are Truck Caps Easy To Remove?

Truck caps are not easy to remove. You will need to use a drill and screwdriver to remove the screws that hold the cap in place. Once you have removed the screws, you will need to pry the cap off of the truck bed. Be careful not to damage the paint on your truck while doing this. After you have removed the truck cap, you will need to sand down any rough edges on the cap so that it is smooth. Once you have sanded down the edges, you will need to apply a sealant to the inside of the cap so that it is waterproof. Apply a generous amount of sealant around all of the seams on the inside of the cap. Allow the sealant to dry for 24 hours before replacing the cap on the truck. [2]

Are Truck Caps Easy To Remove?

What Time Does It Take To Install A Truck Cap?

The average time it takes to install a truck cap is about 30 minutes.

However, this will vary depending on the make and model of your vehicle. Make sure to read the instructions that come with your truck cap before starting the installation process.

Why Should A Truck Cap Be Waterproof?

A truck cap is an important accessory for any truck owner.

Not only does it add style and personality to your truck, but it also protects your cargo from the elements. That’s why it’s important to make sure your truck cap is properly waterproofed.

Why Should A Truck Cap Be Waterproof?

How To Waterproof A Truck Cap?

Method #1: The Bolting Method

Prepare What You’ll Need

  • Tape measure
  • Pencil or marker
  • Drill
  • ¼ inch drill bit
  • Phillips head screwdriver
  • 12 ½ inch x ¾ inch washer head screws with neoprene washers (You’ll need two per side.)
  • Cordless impact driver (This is optional, but will make things go faster.)

Get The Truck Cap Positioned And Ready To Go

You’ll want to place the truck cap on the bed of the truck so that it’s level and centered. Once it’s in position, use the tape measure to find the midway point of each side of the cap. Make a mark with the pencil or marker at each of these points. You’ll also want to make a mark at the front and back of the truck bed on both sides so that you know where the bulkhead is. The bulkhead is usually about 18 inches from the edge of the bed. Now you’re ready to start drilling! [3]

How To Waterproof A Truck Cap?

Method #2: The Tool-Less Method

Gather the Necessary Supplies For The Job

  • Tape measure
  • Permanent marker
  • Ruler or a straight edge
  • Utility knife
  • Scissors
  • Clean rags
  • Rubber gloves
  • (Optional) sandpaper
  • Plastic drop cloths or old newspapers

You will also need the following supplies for waterproofing:

  • Liquid Rubber Sealant/Coating
  • Spray bottle filled with water
  • Mild dish soap

Note: This method is good for small leaks.

How To Waterproof A Truck Cap?

Now that you have all of the necessary supplies, you can begin waterproofing your truck cap!
Here’s how: Begin by cleaning the area around the leak with soap and water. Then, dry the area thoroughly. Next, apply a generous amount of sealant to the leaky area. Be sure to apply sealant to an area slightly larger than the actual leak. Once you have applied the sealant, allow it to dry for 24 hours before using your truck cap. This method is good for small leaks. If you have a larger leak, you may need to take your truck cap to a professional for further repairs. However, if you follow these steps, you should be able to successfully waterproof your truck cap and prevent future leaks! [4]


Are truck caps watertight?

Truck caps are not watertight, but they can be made waterproof with a few simple tips and tricks. truck caps are typically made of fiberglass or aluminum and have a vinyl or cloth interior. If you want your truck cap to be waterproof, use silicone caulk or weatherstripping to seal the seams and gaps. You should also install drain plugs in the floor of the truck cap to allow any water that does get in to drain out. Follow these tips and your truck cap will be able to withstand even the heaviest downpours.

Do I need to waterproof my truck cap?

It depends on how you plan to use your truck cap. If you’re just using it for occasional transportation of light cargo, then you probably don’t need to waterproof it. However, if you’re using your truck cap for camping or as a work space, then it’s a good idea to make it waterproof.

How do I seal the seams and gaps on my truck cap?

The best way to seal seams and gaps is with silicone caulk or weatherstripping. You can find these materials at most hardware stores. Simply apply the caulk or weatherstripping to the inside of the truck cap, being sure to get a good seal around all of the edges.

What are drain plugs and where do I install them?

Drain plugs are simply plugs that allow water to drain out of the truck cap.

They should be installed in the floor of the truck cap, near the edges. This will allow any water that does get in to drain out, instead of pooling inside the truck cap.Installing drain plugs is a simple process. First, drill a hole in the floor of the truck cap near the edge. Next, insert the drain plug into the hole and screw it in place. Be sure to use a waterproof sealant around the edges of the drain plug to create a watertight seal. following these tips, you can easily waterproof your truck cap and keep your cargo dry during even the heaviest downpours.

Do aluminum truck caps leak?

If you have an aluminum truck cap, you may be wondering if it is susceptible to leaking. While aluminum truck caps are not immune to leaks, there are a few things you can do to waterproof your truck cap and prevent leaks.

One way to waterproof your aluminum truck cap is to use a sealant. There are a variety of sealants on the market, so be sure to choose one that is compatible with aluminum. You will also want to make sure that the sealant you choose can withstand extreme temperatures, as this will help to prevent leaks in both hot and cold weather.

Another way to waterproof your aluminum truck cap is by using gaskets. Gaskets create a barrier between the surfaces of two objects, which can help to prevent leaks. You can purchase gaskets that are specifically designed for use with aluminum truck caps, or you can use a universal gasket that will work with any type of truck cap.

Finally, you may also want to consider using weatherstripping to further waterproof your aluminum truck cap.

Weatherstripping is a flexible strip of material that is used to seal the gaps between two surfaces.

It is typically made from rubber or foam, and it can be found at most hardware stores. When applying weatherstripping, be sure to follow the manufacturer’s instructions carefully in order to ensure the best possible results.

How do you seal a truck bed cover?

One way to do it is by using a spray-on sealant. This will create a water-resistant barrier on the surface of the truck cap. You can also use a silicone sealant to create a waterproof seal around the edges of the truck bed cover. Another option is to use a waterproofing agent on the truck bed cover itself. This will help to repel water and keep your belongings dry.If you are looking for tips on how to waterproof a truck cap, then read on!

How do I stop my truck cap from leaking?

Your truck’s cap, or camper shell, is an important part of your vehicle. It helps keep the elements out and your belongings dry. But over time, even the best truck caps can develop leaks. If you’ve noticed water leaking into your truck cap, it’s time to take action. There are a few things you can do to waterproof your truck cap and prevent leaks.

First, check the sealant around the edge of the cap. If there are any cracks or gaps, apply a new layer of sealant. Make sure you use a sealant that is specifically designed for trucks or RVs; regular caulk won’t stand up to the elements like a specialized sealant will. Next, check the weatherstripping around the edges of the cap. If the weatherstripping is old or damaged, it may be time to replace it. You can find replacement weatherstripping at most auto parts stores. Finally, check the roof of your truck for any leaks. If you see any, apply a sealant to those areas as well.

Do Leer caps leak?

Leer caps are not immune to leaks, but there are ways to help waterproof them. You can buy a Leer truck cap sealant kit that includes everything you need to properly seal your truck cap. The kit contains an adhesive backed foam gasket that is placed around the perimeter of the truck cap, as well as a clear silicone sealant.

Another way to help prevent leaks is to make sure the truck cap is properly installed. Make sure the front and rear clamps are tightened securely, and that the side seals are in place.

If your truck has a bed liner, it is also a good idea to apply a bead of silicone sealant around the edge of the liner where it meets the truck bed. This will help create a watertight seal.

If you do find yourself with a leaking truck cap, the first step is to determine where the leak is coming from. If the leak is coming from around the edges of the truck cap, you can try resealing it with silicone sealant or the Leer kit mentioned above. If the leak is coming from somewhere else, such as a cracked window or hole in the cap, you will need to have it repaired by a professional.

Truck caps are not cheap, so it is worth taking the time to properly care for and maintain yours. With proper care and maintenance, your truck cap should last for many years.

Can you lock a truck topper from the inside?

The short answer is yes, you can lock a truck topper from the inside. Most truck toppers come with a locking system that allows you to do this. However, there are a few things to keep in mind when doing so.

First, make sure that all of the windows and doors are properly sealed. If there are any gaps or openings, water can easily get in and ruin your things. Second, consider investing in a quality tarp or cover for added protection. And lastly, if you’ll be away from your truck for an extended period of time, it’s always a good idea to disconnect the battery to prevent any potential issues.

What do you use to insulate a canopy?

There are many ways that you can insulate a canopy, but one of the most popular methods is to use spray foam insulation. This type of insulation is easy to apply and it will create a barrier between the inside and outside of your canopy. It is important to make sure that you apply the spray foam evenly so that there are no gaps or holes in the coverage.

You should also be sure to seal any seams or cracks with caulk before you apply the spray foam. Otherwise, moisture could get into these areas and cause problems later on.

Another way to waterproof your canopy is by using a tarp. Tarps are great for covering large areas quickly and they will keep the rain out if they are properly secured. Be sure to use heavy-duty tarps that are made for outdoor use. You can also use a tarp to cover your canopy if you live in an area that experiences high winds. This will help to keep the canopy from blowing away.

Finally, you can use weatherstripping to seal any gaps around doors and windows. This will create an additional barrier against moisture and wind.

Useful Video: weather sealing my truck cap


There are a few different ways to waterproof your truck cap, and the best method will depend on the materials you’re working with and the level of protection you need. If you’re looking for a quick and easy solution, consider using a waterproofing spray or sealant. For more comprehensive protection, you may want to invest in a waterproof truck cover or tarp. No matter which method you choose, following these tips and tricks will help ensure that your truck cap stays dry and protected from the elements.

Thanks for reading!


  1. https://www.yourdictionary.com/truck-cap
  2. https://amanandhisgear.com/are-truck-toppers-permanent
  3. https://waterprooftips.com/how-to-waterproof-a-truck-cap/
  4. https://www.wildwewander.com/journal/how-to-weatherize-your-truck-cap