To save energy by reducing a baking process by a method in which the resistance of a conductive coating film is measured while the film being unbaked and wet, a finish coat is applied when the resistance is not exceeding a prescribed value which is suitable for electrostatic coating, and a conductive coating film and a finish coating film are baked simultaneously.
A nonconductive member 2 such as an automobile resin bumper is held by a work jig 3, and conductive clip type terminals 1 are attached to both end parts of the member 2. In this state, a conductive coating is applied on the surface of the member 2 to form a conductive coating film 6. Next, the resistance of the coating film 6 is measured while the film 6 being wet. A lead line terminal 7 is inserted into a relay part 5 to form a circuit for passing an electric current from a resistance meter 9, and the resistance of the film 6 is measured. A finish coating film is formed by electrostatic coating on the normal member 2 whose measured resistance is not exceeding a prescribed value. After that, the conductive coating film and the finish coating film are baked simultaneously.
SAKAKIBARA MASATO
MURATE MASASHI
KATO TAKAYUKI
TOYOTA CENTRAL RES & DEV