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Yes, you should reapply sunscreen every 2 hours while outside (WUSA9)

Dermatology

If you take a peek online, you'll find lots of people sharing tips about just how often to reapply sunscreen. Many claim that you should reapply every two hours when you're out in the sun. Dr. Adam Friedman, Professor & Chair of Dermatology verifies with WUSA9 that this is true; but you may need to reapply more frequently if you're swimming or sweating.

Read the full article on WUSA9.com