Do Truck Bed Liners Cause Rust?

When selecting the right bed liner for your pickup truck, it's important to determine the style you want and the type that best meets your needs. That's because while not every bed liner directly leads to rust, some kinds can contribute to it. This is especially true for drop-in bed liners, which Nissan warns can encourage rust to form when moisture accumulates underneath them.

Traditional bed mats and liners can also contribute to rust depending on their design. For example, some manufacturers offer heavy-duty options with built-in features that keep the mat from lying flush with the truck bed. The narrow space between the liner and the bed then allows air to circulate and moisture to dry. However, if the liner or mat doesn't have that technology, the likelihood that water may sit directly on top of the metal increases, which can potentially lead to problems over time.

In contrast, GM uses a factory spray-in bed liner on both GMC and Chevrolet trucks to protect the bed from moisture that can cause rust. That's because the spray-in type bonds to the metal itself, thus keeping moisture from making direct contact with the truck's bed. Ford uses its own factory spray-in bed liner, which also protects the truck from moisture. Since the coating adheres to the truck bed and isn't a separate piece, there's also less of a chance of it moving independently of the bed, as a typical drop-in liner could.

Though some bed liners can lead to rust, not all trucks are better off without them. The key is to use a properly fitted liner with a ribbed design that allows water to drain. This can help lessen the chance of rust in the long term. A liner can also protect the bed by decreasing the likelihood of corrosion, as well as dents and scratches. Additionally, a tailgate liner can help protect the metal.

Before you install a liner, clean the truck bed first, and let it dry completely. Then check the bed for damage that may need to be repaired, as you don't want any problems after the fact. Use the correct type of paint for your truck to cover up any scratches you may find, , so the exposed metal doesn't corrode later. It's also a good idea to follow this process before using a spray-in bed liner.

Once you install a liner or mat, it's important to remove it and check the bed for signs of moisture at least once a month. Begin with a visual inspection of the drains in the corners to ensure they're not clogged. Safely remove any debris with a hand tool, taking care not to scratch the metal. Check the bed for any signs of rust and address them immediately. Sweep the bed out, and if it needs to be washed, be sure the metal is completely dry before reinstalling the liner.