Abstract: An outer surface of an object such as an automotive vehicle body is painted by conveying the object in one direction, moving a painting apparatus in a direction opposite to the one direction, and applying a paint coating to the outer surface of the object from the painting apparatus. The painting apparatus includes a plurality of paint spray guns which are displaceable in a direction transverse to the direction in which the object is conveyed. The paint spray guns are directed substantially perpendicularly to and spaced a predetermined distance from the surface of the object.

Abstract: A substantially vertical surface of an object such as a vertical rear surface of an automotive body is coated in a coating booth in which a fluid such as air is supplied a downward direction to forcibly lower a mist of floating paint particles. Paint spray guns for ejecting paint sprays are positioned perpendicularly to the vertical surface. Then, the paint spray guns are displayed with respect to the vertical surface in a direction against the downward direction in which the fluid is supplied, while ejecting paint sprays from the paint spraying means to coat the vertical surface.