How much sunscreen should be applied to get the protection advertised on Jane Iredale SPF’s?

According to the American Academy of Dermatology you should use enough sunscreen to generously coat all skin that will not be covered by clothing. One ounce, enough to fill a shot glass, is considered the amount needed to cover the exposed areas of the entire body. You should apply our sunscreen liberally and evenly over face and body 15 minutes before sun exposure and re-apply approximately every two hours or after swimming or sweating heavily according to packaging directions._ jane iredale_ sunscreen products are water-resistant up to 40 Minutes. This means that the sunscreen remains effective for 40 minutes while you are swimming or sweating.