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Chevrolet Silverado 1999-2006: How to Keep Rocker Panels from Rusting Out

Rocker panel rust is a common issue on several generations of the Chevy Silverado. This article will show you how to prevent your truck from succumbing to these rust issues.

By Brett Foote - June 4, 2015

This article applies to the Chevrolet Silverado 1500 (1996-2006).

Rust is one of the biggest enemies of automotive enthusiasts everywhere, as it is a slow, creeping destroyer of metal parts. Like many trucks, the rocker panels of a Chevy Silverado are common areas where rust eventually develops. Whether you want to call it a design flaw or just simply a headache waiting to happen, rocker panel rust can ruin your truck's resale value in no time. The best way to combat rust is to do a little preventative maintenance rather than just waiting and hoping it doesn't appear. Here are a few things you can do to keep your rocker panels clean and rust-free.

Mud Flaps

An easy and inexpensive way to keep moisture from getting to your rocker panels in the first place is to install a set of mud flaps. There is a small hole inside of the seam that runs alongside the wheel wells in the rear where three body panels come together. Over time, water, dirt, and salt makes their way into this hole and eventually turn your rocker panels into a rusty mess. Mud Flaps cover the hole and prevent this from happening.

Figure 1. A set of mud flaps protects your rocker panels from rust..

Caulk the Holes

If you don't want to install mud flaps, you can try and seal the holes in the rear rockers. Some have reported success using this method, which effectively seals things up and keeps road grime from getting in to this hard-to-reach area.

Figure 2. A little caulk prevents rust-causing contaminants from getting into your rockers.

Apply Oil to Trouble Areas

If you live in an area where roads are salted in the winter time, applying oil to the underside and inside the door panels can prevent the salt from sticking and causing rust problems. WD-40, Power Lube, Marvel, and similar products will do the trick.

Figure 3. Applying oil to trouble areas keeps salt from sticking and rust from forming.

Apply Undercoating

Undercoating provides an extra layer of protection between your sheet metal and outside elements. While you can pay to have this done, it's also pretty easy to do yourself. Just make sure the surface is clean and roughed up with sandpaper before application to make it stick. Roll-on bed liner material works equally well.

Figure 4. Undercoating helps provide a layer of protection from rust.

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