PURPOSE: To provide a stereospecific effect, a weather-proof property, and a beautiful appearance, by altering partly the orientation of magnetic powder in a coated film with magnetic force.

CONSTITUTION: Coating (A) is made of polyester resin for instance added with stainless powder as magnetic powder. Next, color steel plates are continuously transferred to the arrow direction as materials 14 coated with coating. The coating (A) is continuously applied from a coating feeder 1 to the coated face 14a. Next, electric current is conducted to fine fractions composing an electro magnet of a magnetic rotor 2 by the signals from a controller 15 to arrange the magnetic powder within the wet coating film (A) as an electromagnet. Subsequently, transparent acrylic coating is applied on the material 14 from an over-coating discharger 8. And then, it is conveyed to a baking furnace 9 and the solvent is evaporated and it is cooled after baking and then transferred to the outside.