Abstract: A blasting apparatus for spraying a flowable cleaning or treating material onto a part comprises a cabinet having a treating chamber formed with an opening within which a door and base support are rotatably mounted. A part support platform is mounted to the base support on opposite sides of the door so that while one platform is located within the treating chamber for spraying a part it supports, the other platform is located outside of the treating chamber to permit loading and unloading of parts thereon. An inflatable seal is mounted on the periphery of the door or cabinet opening to prevent escape of material from the treating chamber. Independently controlled drive trains are provided to rotate the door between an open and closed position, and to effect rotation of the platforms relative to the door when they are positioned within the treating chamber.