How Do You Waterproof a Truck Bed Topper?

Have you ever needed to waterproof your truck bed? Whether you’re hauling cargo in wet weather, or just want to protect your belongings from moisture and dirt, a truck bed topper can be a great solution.

But what if you also need to waterproof it? Fortunately, there are some easy steps that you can take to make sure your truck bed is protected from the elements.

Step 1: Clean the Bed
The first step in waterproofing your truck bed is to give it a thorough cleaning. Use a pressure washer and soap to remove any dirt, debris, or grime from the surface. Once the bed is cleaned, dry it off completely with a towel or cloth.

Step 2: Apply Sealant
Once the surface of your truck bed has been cleaned and dried, it’s time to apply a sealant. Make sure that the sealant is designed for use on trucks and follow the manufacturer’s directions for proper application.

When applying sealants, make sure that you spread them evenly and cover all surfaces of the bed. Allow the sealant to dry completely before moving on to the next step.

Step 3: Install Truck Bed Topper
Now that your truck bed is clean and sealed, it’s time to install your truck bed topper. Make sure that you measure twice before cutting so that you get an accurate fit for your vehicle. If necessary, use self-tapping screws or rivets for installation instead of regular screws so that they remain secure even in wet weather conditions.

Step 4: Apply Waterproof Membrane
Once your truck bed topper has been installed properly, it’s time to apply a waterproof membrane over top of it. This membrane will help keep water out while still allowing air flow into the area beneath your truck bed cover. Make sure that you overlap each piece of membrane when applying so that there are no gaps where water could enter through.


Waterproofing a truck bed with a topper doesn’t have to be difficult or time-consuming; with these simple steps, anyone can make sure their cargo stays dry no matter what Mother Nature throws at them! By following these four steps – cleaning the surface, applying sealant, installing a quality truck bed cover and applying a waterproof membrane – anyone can easily make their cargo area weatherproof in no time at all!

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Susan Delgado