Rust spots appearing on the car body

Symptoms

• Small orange-brown spots on the paint surface
• Spots often near stone chips, scratches, or door edges
• Rust may be raised or flaking slightly
• Can appear on wheel arches, rocker panels, or around trim

Likely causes

• CommonPaint chip or scratch exposing bare metalEven a small chip lets moisture reach unprotected steel, starting the rust process.
• CommonRoad salt exposureSalt used on winter roads is highly corrosive and accelerates rust, especially in wheel wells and lower panels.
• PossibleTrapped moisture behind trim or sealsWater can get behind moldings or seals and rust the metal underneath without being obvious from outside.
• PossibleAge and general wear of factory rust protectionRust-proofing coatings break down over many years, especially in humid or salty climates.

What to do

1. Clean the area gently and assess how deep the rust goes; surface rust on paint is much easier to fix than rust that's eaten into metal.
2. Lightly sand the spot to remove loose rust and feather the edges of the surrounding paint.
3. Apply a rust converter or primer made for automotive use to stop further corrosion.
4. Use a matching touch-up paint and clear coat for small spots, following the product's instructions for layering and dry time.
5. Wash off road salt regularly in winter, especially the undercarriage and wheel wells, to slow future rust.
6. Have a body shop address larger or deeper rust spots, especially if the metal feels soft or has bubbled paint, since this may indicate rust-through.

Tools and parts

• Sandpaper (fine grit)
• Rust converter/primer
• Touch-up paint and clear coat

When to call a pro

See a body shop for rust that's spread significantly or feels soft to the touch, since that may mean the metal underneath is compromised.

Safety