A coating system includes a coating device, a suction device, and a conveyor system. The coating device includes a first holding device including a first surface, a second holding device including a recess and opposite to the first holding device, an o-ring positioned on the first surface. The first holding device couples to the second holding device and a component is held on the first surface. A forming cavity is surrounded by the component, the recess, and the o-ring. Glue is injected into the forming cavity and is formed films over the component.