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Sunscreen
Reapply sunscreen every two to three hours, and after swimming or sweating heavily.
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Do waterproof sunscreens last all day?
Reapply sunscreen every two to three hours, and after swimming or sweating heavily.
Most sunscreens and sunblocks are only effective for about four hours, and even "waterproof" or "sweat proof" formulas can wear off after 80 minutes of activity. Therefore, you should reapply sunscreen every two or three hours--and more often if swimming or sweating a lot.
