an apparatus including of a mold for slush molding articles of a least two colors ; a tank ; a separation wall disposed in the tank and dividing the tank into two spaces ; a gasket mounted on a free edge of the separation wall which faces the mold , the gasket having a plurality of rigid inserts disposed therein in a predetermined distribution ; and an actuator device which expands and retracts the rigid inserts thereby correspondingly expanding and retracting the gasket . a method for slush molding utilizes the apparatus .