Why do rocker panels rust?

Rust is a common problem that affects various parts of a vehicle, including the rocker panels. Rocker panels are located along the sides of a vehicle, between the wheel wells, and they serve multiple purposes. They provide structural support, protect the lower body of the vehicle from debris and water, and add aesthetic appeal to the overall design. However, over time, rocker panels are susceptible to rust, which can affect their functionality and appearance. In this article, we will explore the reasons behind rocker panel rust and discuss ways to prevent it.

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Rocker panel rust is primarily caused by exposure to moisture and other corrosive elements present on the roads. Moisture can come from rain, snow, or even dew, and it often contains various chemicals, including road salt, which is often used to prevent icing during the winter season. Salt acts as a catalyst, accelerating the corrosion process. Additionally, moisture can become trapped between the rocker panel and the surrounding body parts, creating an ideal environment for rust to develop.

Rocker panel rust can also be a result of rock chips and road debris. When driving, small rocks and other debris can be kicked up from the road and hit the rocker panels. These impacts can chip the paint and expose the metal beneath. Once the metal is exposed, it becomes vulnerable to rust formation, especially if moisture is present.

Another factor contributing to rocker panel rust is poor or inadequate factory paint application. In some cases, the rocker panels may not have been properly prepared or primed before the paint was applied, leading to poor adhesion and eventually, the paint can peel or chip away, exposing the metal. Once again, once the metal is exposed, rust can develop.

Moreover, rust can also occur due to neglect and lack of maintenance. Regular cleaning and waxing can help protect the rocker panels from rust formation. Neglecting to clean and wax the rocker panels can lead to the buildup of dirt, grime, and debris, which can retain moisture and promote rust.

Preventing rocker panel rust requires a combination of proactive measures and regular maintenance. Here are some tips to help keep rocker panels rust-free:

Washing and waxing: Regularly clean your vehicle, paying attention to the rocker panels. Use a mild detergent and a soft brush or sponge to remove dirt, grime, and road salt. By keeping the rocker panels clean, you reduce the chances of rust formation. Additionally, applying a coat of wax after cleaning can help protect the paint and prevent moisture from reaching the metal.
Rustproofing: Consider rustproofing your rocker panels. There are various rustproofing treatments available, including oils, waxes, and chemical coatings, that can be applied to the rocker panels to create a protective barrier against moisture and road salt. Consult your local automotive specialist or body shop for the best rustproofing options for your specific vehicle.
Repair paint chips and scratches promptly: Inspect the rocker panels regularly for any paint chips, scratches, or dents. If you notice any, repair them promptly to prevent rust from forming. Use touch-up paint or seek professional help for larger or more severe damage.

Apply protective film or tape: There are protective films and tapes available specifically designed to shield the rocker panels from rock chips and road debris. These films or tapes can be applied to the surface of the rocker panels, adding an extra layer of protection and reducing the risk of rust formation.
Avoid driving on salted roads: During the winter season, roads are often salted to prevent icing. If possible, avoid driving on heavily salted roads as much as you can. Salt accelerates rust formation, so minimizing exposure to it can help protect your rocker panels.
Regular inspections: Regularly inspect your rocker panels, especially during routine maintenance or tire rotations, for signs of rust. By catching rust early, you can prevent it from spreading and causing further damage. Pay attention to areas where the paint may have been chipped or scratched, as these are the most vulnerable spots.

How to protect rocker panels from rust

Rocker panels are prone to rusting because they are often exposed to moisture, dirt, and debris. To protect rocker panels from rust, here are some steps you can take:

Clean the rocker panels: Start by thoroughly cleaning the rocker panels. Use a hose and a mild detergent to remove any dirt, grime, or road salt. Scrub the panels gently with a brush or sponge, paying special attention to any areas where rust may have started to form.
Dry the rocker panels: After cleaning, make sure the rocker panels are completely dry. Use a clean cloth or a leaf blower to remove any excess moisture. Moisture that gets trapped between the panels and the vehicle’s body can accelerate rusting.

Apply a rust-proofing product: There are various rust-proofing products available on the market, such as rust inhibitors, rust converter sprays, or undercoating. Choose a product that is specifically designed to prevent and inhibit rust formation. Follow the manufacturer’s instructions on how to apply the product.
Spray on a protective coating: Once the rust-proofing product has dried, apply a protective coating to the rocker panels. This can be a rubberized undercoating, a spray-on bed liner, or a sealant specifically

Is rocker rust a definite deal breaker?

Rocker rust is not necessarily a definite deal breaker, as it depends on the severity and location of the rust, as well as the overall condition of the vehicle. Minor surface rust on the rocker panels can often be repaired relatively easily and should not greatly affect the functionality or safety of the vehicle. However, extensive rust that has caused structural damage or compromised the integrity of the rocker panels can be a serious issue, and may indicate further hidden rust problems in other areas of the car. It is always recommended to have a professional inspection before purchasing a vehicle with rocker rust to fully assess the extent of the damage and determine if it is a wise investment.