Instead of telling you to stay out of the sun altogether, Dr. Schultz's rule of thumb is to make sure you're protected while in the sun. Not surprisingly, your top line of defense against damage from the sun is... sunscreen! But, surprisingly, the majority of sunscreen users apply it incorrectly. Many people believe that applying sunscreen once will protect them throughout the entire day, but this is a common misconception. Throughout the day you rub, sweat and participate in activities that wash off the sunscreen, leaving you defenseless from powerful sun rays. It's for these exact reasons that people end up getting sunburned after a long day in the sun. Protect your skin, and follow Dr. Schultz's advice to avoid future sunburns.