Motor cars are coated with ......

Explanation

**Step-by-Step Solution:**

1. **Identify the Coating Material**: Motor cars are typically coated with a specific type of paint designed for automotive use. This is known as **automotive paint**.

2. **Purpose of the Coating**: The primary purpose of automotive paint is to protect the vehicle from various environmental factors. This includes:
- **Corrosion**: Automotive paint acts as a barrier against moisture and other corrosive elements that can lead to rust.
- **Heat Differences**: The paint helps in managing temperature variations that the vehicle may experience.
- **Physical Damage**: It protects against physical impacts such as bumps and stone chips that can damage the car's surface.
- **UV Light**: Automotive paint provides protection against ultraviolet (UV) rays, which can cause fading and deterioration of the vehicle's exterior.

3. **Improvement of Application**: Automotive paint is formulated to improve adhesion to the car's surface, making it easier for the paint to stick and ensuring a smooth finish.

4. **Conclusion**: Therefore, we conclude that motor cars are coated with **automotive paint** due to its protective properties and ease of application.

---