Hand-painting a car is a lot like hand-painting a new kitchen, it’s all in the preparation.
1. Sand the surface of the car until it is smooth and dulled and ready for a primer coat.
2. The entire car body must then be cleaned with white spirits to ensure there is no dust.
3. After that, it’s all in the application. The proper paintbrushes, mix of paint and conditioners ensures that the paint will “rest” properly. Use the natural paneling of the car to determine how much of the car you paint at any one time, as illustrated here in the photo.
You would only hand-paint particular vintage cars. It actually finishes very well with a certain visual warmth you can only get with expertly applied paint using a paintbrush.