A method of applying coating medium to a surface of an object, the method including applying coating medium to an inner region of the surface such that the coating medium on the inner region has an inner thickness; and applying coating medium to an outer region of the surface, adjacent to the inner region, to form an edge of the coating medium at a side of the outer region opposite to the inner region and such that the coating medium on the outer region has an outer thickness, wherein a minimum value of the outer thickness is 30% to 80% of the inner thickness, and wherein a maximum 10 value of the outer thickness is equal to or less than the inner thickness. A control system for controlling application of coating medium and a coating system for applying coating medium are also provided.