7 Dangerous Sunscreen Mistakes Not to Make This Summer

You could be using sunscreen, but if you're not applying enough, you're not protected. "To achieve the sun protection factor (SPF, which measures the protection against UVB only) reflected on a bottle of sunscreen, you should use the equivalent of two tablespoons of sunscreen to the exposed areas of the face and body — a nickel-sized dollop to the face alone," says Mayoral. That might sound like a lot, but that's really how much you need.

Using a spray? Apply until an even sheen appears on the skin. And don't forget that either way, you should be reapplying every two hours or more frequently after swimming, heavy perspiration, or toweling off.