To provide a method for coating a liquid sealing agent capable of suppressing the wasteful use thereof accompanied by the practice of throwing-away-shot, while suppressing the occurrence of nozzle clogging.

The method for coating a liquid sealing agent comprising: a step of applying a mixed sealing agent of predetermined ratio onto a mixed sealing agent coating region shown in a broken line out of a predetermined coating region 31 of a chain case 18; and a step of applying a sealing agent of base resin only containing no curing accelerator onto a region that is to be finally coated (coating final point G) out of the region 31, wherein a liquid sealing agent coating device capable of arbitrarily controlling the mixing ratio of the base agent and curing accelerator in the mixed sealing agent is used to coat the mixed sealing agent delivered from a nozzle onto the region 31 of the case 18.