Apply to face and body prior to going out in the sun for effective broad-spectrum sun protection that stays put in the presence of sweat or water. Apply at least 15 minutes before sun exposure to allow the sunscreen to absorb into the skin. It's important to apply the correct amount of sunscreen to get the proper protection—an average size person should use one ounce of sunscreen to cover the body with one application. This is the amount that would fit in a shot glass. Reapply after heavy perspiration, swimming or towel drying, or after 60-80 minutes of sun exposure. Remember, 80% of sun damage comes from incidental sun exposure, like driving your car or walking your dog. Use Sun Guard any time you are exposed to the sun, even during routine daily activities, as well as for outdoor workouts, beach outings and sporting events.