Will the Car Continue to Rust After Touch-Up Painting?
2 Answers
If the rust layer is not completely removed before touch-up painting, the car will continue to rust over time. Causes of Rust: Rust mainly occurs when the metal body is exposed to the external environment after scratches, or due to small stones hitting the car body while driving. Long-term outdoor parking can also lead to rust. Additionally, areas prone to water accumulation, such as the inner and outer edges of the wheel arches, the bottom of doors and trunk, and corners, are more susceptible to rust over time. Methods to Deal with Car Paint Rust: First, use very fine sandpaper dipped in water to gently remove the rust spots, then clean it thoroughly and apply a layer of primer to prevent the rust from spreading or worsening. Alternatively, you can purchase a touch-up pen. After the primer dries, sand it smooth with fine sandpaper and then use the touch-up pen for color matching.
Will a car still rust after touch-up painting? It depends on how the rust is treated. With decades of auto repair experience, I've seen countless cases: if rust isn't thoroughly removed and only hastily covered with paint, it will silently spread beneath, especially in humid areas or coastal regions. For instance, when a car door panel rusts, you must first grind away all rust traces, then seal the pores with anti-rust primer before applying topcoat. Otherwise, rust spots will reappear within months, potentially eating through the metal. Last year, a client opted for cheap touch-up without rust removal, resulting in chassis perforation six months later and costly repairs. I recommend professional shops for complete rust treatment, followed by regular washing and waxing to protect against rain and salt corrosion. Properly done, touch-up paint can last 5-6 years rust-free, safeguarding your vehicle's integrity.
