Method for forming two-color coating layer

A method for forming a two-color coating layer, comprising steps of:

• a) conducting a coating process by applying a coating layer on a workpiece that has a stepped surface, so that the coating layer that has a first color is formed on the stepped surface of the workpiece, wherein the stepped surface has a lower region, an upper region that is higher than the lower region, and a middle shoulder region that connects the lower region and the upper region;
• b) after step a), forming an ink layer that has a second color and that covers the coating layer formed on all of the lower region, the upper region, and the middle shoulder region of the stepped surface;
• c) soft baking the ink layer from step b);
• d) exposing to light a first area of the ink layer from step c) so that the first area of the ink layer undergoes a crosslinking reaction, wherein the first area of the ink layer corresponds to the lower region of the stepped surface and the middle shoulder region of the stepped surface;
• e) developing the ink layer from step d) so that a second area of the ink layer, which is unexposed to light, is removed, thereby exposing the first color of the coating layer formed on the upper region of the stepped surface, wherein the second area of the ink layer is not crosslinked and corresponds to the upper region of the stepped surface;
• and
• f) hard baking the ink layer from step e), wherein the stepped surface has the second color formed on the lower region of the stepped surface and the middle shoulder region of the stepped surface, and the first color formed on the upper region of the stepped surface.