Apply this product 15 minutes before sun exposure, take proper amount in your hands, evenly apply it, and massage in circles until it is absorbed. According to the inquiry of Kans official website, Kans should apply this product 15 minutes before sun exposure, take a proper amount in your hand, evenly apply it, and massage in circles until it is absorbed. In order to ensure the effect, it is recommended to apply the product once every one to three hours when the sun is strong.