How much sunscreen should I actually use?

Use a shot glass full for your body and a two-finger strip (index and middle finger) for your face and neck—about a teaspoon for the face alone. Spray until skin glistens, then rub in. Apply 15 minutes before going out, reapply every two hours or after swimming/sweating, and don’t miss ears, back of neck, tops of feet, or hair part.