The most cost effective and fast method of selective coating is pen coating. Selective coating requires masking of parts in conventional rock coating systems. In most production processes, the masking method can result in additional labor, time, and material cost. The main objective of pen plating users is to obtain a plating quality similar to rock plating. In the application of pencil coating, the power supply and coating pen are the most important factors in the user’s success. Very fast coating on sensitive and very small surfaces is the basis and purpose of the pen coating system.