Coating method

A coating method comprising:

• a coating step for spraying a surface of a substrate with a paint;
• and
• a drying step for drying the paint sprayed on the surface of the substrate;
• wherein the paint is sprayed during the coating step to form a coating a film thickness which is thinner than a thickness at which the coat begins to sag in either the coating step or the drying step;
• wherein an action is applied from outside the substrate in at least one of the coating and drying steps so as to cause the paint coated on the substrate to flow or sag in the drying step;
• and
• wherein the substrate is rotated about an axis extending substantially horizontally in a longitudinal direction of the substrate while the paint of the coat flows as a result of the application of the action from the outside at a speed which is high enough to rotate the substrate before the paint of the coat substantially sags due to gravity yet which is low enough so as to cause no sagging as a result of centrifugal force.