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How to Choose the Right SPF for Your Body
The recommended amount is about an ounce and a half of liquid sunscreen. Dr. Ida Arengo from Baylor University says spray sunscreens are a bit risky because the spray is easy to miss a whole area of your body. If you're exposed to the water, even with sunscreen labeled as water resistant, you're really only getting about 80 to 90 minutes of protection.