How to Repair Rust on Car Body

As a car owner, dealing with rust on the car body can be frustrating. Rust can damage the appearance of your car and lower its value. Not only that, but rust can also weaken the structural integrity of your car, making it unsafe to drive. Fortunately, repairing rust on the car body is not as difficult as you might think. In this article, we will guide you on how to repair rust on your car body.
Car With Rust On Body

What Causes Rust on Car Body?

Rust is a common problem for car owners, especially in areas with high humidity or where roads are frequently salted during the winter. Rust occurs when iron in the metal reacts with oxygen and moisture in the air, forming iron oxide or rust. If left untreated, rust can spread quickly and cause serious damage to your car.

How to Repair Rust on Car Body

Gather the Materials

Before you start repairing rust on your car body, you will need to gather the necessary materials. Here's what you'll need:

  • Sandpaper (80-grit, 120-grit, and 220-grit)
  • Body filler
  • Putty knife
  • Primer
  • Spray paint
  • Clear coat
  • Masking tape

Prepare the Area

Next, you'll need to prepare the area for repair. Here's what you'll need to do:

  1. Clean the area around the rust spot with soap and water.
  2. Sand the area with 80-grit sandpaper until the rust is completely removed.
  3. Use 120-grit sandpaper to smooth out the area and remove any remaining rust.
  4. Use 220-grit sandpaper to smooth out the area further.
  5. Clean the area again with soap and water and let it dry completely.
  6. Use masking tape to cover the area around the rust spot, leaving only the rusted area exposed.

Apply Body Filler

Now it's time to apply the body filler:

  1. Mix the body filler according to the manufacturer's instructions.
  2. Apply the body filler to the rusted area using a putty knife.
  3. Smooth out the body filler with the putty knife.
  4. Let the body filler dry completely.
  5. Sand the body filler with 220-grit sandpaper until it is smooth and even with the surrounding area.

Paint the Area

Finally, it's time to paint the area:

  1. Apply a coat of primer to the repaired area.
  2. Let the primer dry completely.
  3. Apply a coat of spray paint to the repaired area.
  4. Let the spray paint dry completely.
  5. Apply a coat of clear coat to the repaired area.
  6. Let the clear coat dry completely.

Pros and Cons of Repairing Rust on Car Body


  • Restores the appearance of your car.
  • Prevents rust from spreading and causing further damage to your car.
  • Increases the resale value of your car.


  • Can be time-consuming and require some skill to complete.
  • May not be a permanent solution if the rust is caused by an underlying issue.
  • Can be expensive if you choose to have a professional do the repair.


Repairing rust on your car body is an important step in preserving the appearance and safety of your car. While it may require some time and effort, it can be a rewarding experience. By following the steps outlined in this article, you can repair rust on your car body and ensure that your car looks and performs its best.


Q: Can I repair rust on my car body myself?

A: Yes, you can repair rust on your car body yourself. However, it may require some skill and experience to complete the repair properly.

Q: How long does it take to repair rust on a car body?

A: The time it takes to repair rust on a car body can vary depending on the extent of the damage. It can take anywhere from a few hours to a few days to complete the repair.

Q: Can I prevent rust from forming on my car body?

A: Yes, you can prevent rust from forming on your car body by keeping it clean, waxed, and dry. You can also apply rust inhibitor products to your car.

Q: Is it worth repairing rust on an old car?

A: It depends on the extent of the rust damage and the condition of the car. If the car is in good condition and the rust damage is minor, it may be worth repairing. However, if the car is in poor condition and the rust damage is extensive, it may not be worth repairing.