It is most effective to apply it one month before the breeding season of barnacles and green algae (see the breeding season table here). Specifically, we recommend around May to June for measures against animals such as barnacles, and around September to October for measures against plants such as green algae and slime. In addition, since the paint does not like the humidity caused by rain and the paint film does not dry easily during the rainy season, it is appropriate to avoid the rainy season and apply the first paint around May and the second paint around October.