How To Fix A Leaking Tonneau Cover

Last Updated on July 13, 2021

Tonneau covers can be considered an important part of every truck owner’s life, whether they’re traveling in the hot summer heat or through the snow in the winter. The problem is that Tonneau covers in general are constructed of vinyl or polyester, both of which are scratch-prone and not always totally waterproof.

It’s possible that perhaps the padding or side seal is insufficient, resulting in leaking through the edges of the bed cover; nevertheless, this does not always mean it’s useless. You must understand how to repair a leaky Tonneau cover to avoid having to pay extra money every time there is a wet spot in the cargo.

Using this Do-It-Yourself solution to fix leaking spots anywhere on the cover is much less expensive, and if done correctly, it may provide you a couple of extra years of use. We’ve put up a simple and clear set of instructions that will show you how to fix the leak of a Tonneau cover in no time.

Some Things That Can Repair a Leaky Cover

1# Drainage Water Pipes Can Be Installed

If your tonneau cover leaks on the sides, then one of the best solutions is installing water pipes that have rubber insulation on their sides. They usually have adhesives and slits on the sides to patch the gaps immediately.

You also can combine them to satisfy your need to cover the entire surface area.

The pipes help stiffen the bed cover, allowing to drip the extra water and reducing stagnation (the most common cause of leaks). They can also be used with tonneau covers that are rolled or folded.

They’re available on many online shopping sites, or you may go to the local store and get one that suits your tonneau cover the best.

2# Extra Seals Might Do The Trick

Another simple solution to cover side leaks of the tonneau cover, if they are small in size, is to install another seal. Purchase cover seals that fully resemble or appear to be compatible with the current seal that you own and then install them at the leak’s source.

Extra seals, on the other hand, are not the ideal option when dealing with huge holes because they may result in more leaks.

3# Bed Seal Kits Are Awesome

These kits maintain the condition of the cargo bed. This package includes seals, straighteners, and foam blocks, so you get all you need to keep water out. It shields the tonneau covers from rain as well as from snowfall and dirt.

It is more expensive than the rest, but it is also more effective. Your money will not go in vain because you will not require any additional resources. A drainage system may be included in some kits to prevent water from accumulating behind the truck.

Note: If you own a honda ridgeline, then you can check our reviews of 2021 honda ridgeline tonneau cover.

A Step-by-Step Guide To Fix Tonneau Cover Leaks

Step 1: Find Out The Source

This can be considered the most important step in preventing tonneau cover leaks. You might need a helping hand to figure out the source of that water, in simple terms where is it coming from? There are 2 methods for locating leaky areas.

Method of Making Fake Rain

  • If you already own a gardening hose and have a water supply to connect it with, then this will be a simple task. At first, Cover the cargo bed lining with dry cardboard. You have to cover your cargo bed completely, including the tailgate.
  • Now you have to sprinkle some water on the top side of your tonneau cover to simulate rain, make sure you don’t pressurize the cover with the water.
  • After the rainfall, open the cover slowly and look for damp spots on the dry cardboard to identify where the leaks are.

Once you’ve finished, use some tape or even better a bright marker to mark the leaking areas. This procedure is great since it allows you to find even the smallest leaks present in your tonneau cover.

Examined in the daylight

  • Pack the truck in an open area with plenty of natural light.
  • To the back, keep the tonneau cover close.
  • While inside the cargo bed, get assistance closing the tailgate.
  • Look for any areas where light can enter the cargo bed.

This is an excellent tool for quickly detecting leaks. You can also see if the cloth has any large scratches. However, it is ineffective in detecting the tiniest breaches.

Step 2: Sealing Off The Leaks

Leaks are easiest stopped if they are blocked from the top side of the cover. To avoid water from flowing past the seal, make sure the sealing material adheres properly to the lining of the bed cover.

Measuring the size of the spot will help you to determine which material will best seal them off. If the leaks are emanating from the sides, carefully place the seals or insulation pipes over leaking spots.

You can use waterproof adhesive tape to cover scratches in the tonneau cover’s fabric.

Step 3: Test and Repeat

You must test the seals to ensure that they are in great working order. We recommend conducting the tests with water to ensure that it will not leak next time you ride during rain.

Cover your cargo bed and inspect it using one method from the two leak-finding methods mentioned above once all leaks have been discovered. If there remain any additional leaks, repeat the procedure.

If you continue to have leaks in your tonneau cover after completing the method, you can seek professional assistance or purchase a new tonneau cover.


A tonneau cover is an essential part of any truck. It’s essential for keeping your stuff safe from the elements and inquisitive eyes, but it’s only useful if it’s waterproof.

A leaky tonneau cover might be inconvenient, especially if you’re transporting cargos that are water-sensitive. A few cover leaks, on the other hand, do not make a cover useless.

You can fix them right away by purchasing the appropriate sealing material, locating the leaks, and sealing them off once and for all. This article contains all of the information you’ll need to restore your tonneau cover’s waterproof characteristics.

How To Fix A Leaking Tonneau Cover

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