Rust developing on 2017 Outlander Sport rear fenders

ClearTheCode admin answer:

1. Common Rust Spots: Unfortunately, the rear wheel wells are a common area for rust to begin on many vehicles, including some Mitsubishi models, especially in regions with harsh winters and road salt. This is often due to stone chips damaging the paint, allowing moisture and salt to penetrate to the bare metal.
2. Early Intervention is Key: Addressing rust early is crucial to prevent it from spreading and becoming a much larger, more expensive repair. Surface rust is far easier to manage than deep, penetrating corrosion.
3. DIY Surface Rust Treatment: For minor surface rust, you can often tackle it yourself:
   • Clean the Area: Thoroughly wash and dry the affected area.
   • Remove Loose Rust: Use a wire brush or sandpaper (starting with coarser grit, then finer) to remove all visible rust down to bare metal. Feather the edges into the good paint.
   • Apply Rust Converter/Primer: Apply a rust converter product, which chemically changes rust into a stable, paintable surface, or an automotive-grade rust-inhibiting primer.
   • Paint and Clear Coat: Apply touch-up paint matching your vehicle's color, followed by a clear coat to protect the new paint.
4. Professional Repair: If the rust has perforated the metal, or if you're uncomfortable with DIY methods, it's best to consult a professional body shop. They can properly cut out rusted sections, weld in new metal, and ensure a seamless, long-lasting repair.
5. Prevention: To prevent future rust:
   • Regularly wash your vehicle, especially in winter, paying attention to wheel wells and undercarriage.
   • Consider applying a rust-proofing treatment or undercoating.
   • Address any new paint chips promptly with touch-up paint.
6. Check for Recalls/TSBs: While less common for general rust, it's always worth checking with a Mitsubishi dealership if there are any technical service bulletins (TSBs) or recalls related to paint adhesion or corrosion protection for your specific model year.