How to paint a rust spot on a car with spray paint

Repairing a car’s paint with spray paint requires careful preparation. By following these DIY instructions, you can achieve great results and save on painting costs.

Watch a short video or read the instructions below

In this video, we repair rust damage on a car’s trunk lid.

What you’ll need for spot painting a car with spray paint:

• Maston Degreaser (Product No. 400006)
• Maston 1K Etch Primer (Product No. 400500)
• Maston Acetone (Product No. 605001)
• Maston CarColor Spray Paint
• Maston CarColor Clear Coat
• Sandpaper
• Clean cloth
• Painter’s tape
• Protective materials (e.g., newspapers)

The products can be found at the end of the article.

Spot painting a rust spot on a car with spray paint – Steps for a successful application:

1. Preparation

• Choose a suitable location for painting.
• Protect any areas you don’t want to paint to prevent overspray and other damage.

2. Application

• Sand the surface thoroughly to remove all rust and old, worn-out paint.
• Clean the surface with Maston Degreaser to remove grease and dust.
• Ensure the surface is completely dry.
• Apply several thin layers of Maston Etch Primer as a base.
• Carefully remove any excess paint with Maston Acetone.
• Apply the first coat lightly (a very thin mist coat) using Maston CarColor spray paint.
• Let each coat dry for 5 minutes before applying the next.
• Spray multiple thin layers to achieve a smooth, glossy finish.
• Note: Clear-coat metallic colors with a metal lacquer to achieve the correct shade and shine. Apply clear coat to solid colors as well to improve durability and enhance gloss.
• Coverage: Approx. 1.5m² (topcoat).

3. Drying Time

• Check the drying time for each type of paint in the manufacturer’s instructions or on the icons on the back of the bottle.
• CarColor drying times: Touch-dry in 30 minutes, fully dry in 24 hours.

4. Cleaning

• We recommend using Maston Acetone.

Tips for Best Results

• Always work in a well-ventilated area to avoid inhaling fumes.
• Test the paint on a small, inconspicuous area first to ensure compatibility.
• Take your time at each step to achieve a high-quality finish.

By following these instructions, you can restore the painted area to a like-new condition without major repairs. Applying a fresh coat of paint is a cost-effective and relatively easy way to revitalize a worn-out surface.

The results can be seen below

Maston products outside of Finland, please check your local retailers