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How often should I reapply sunscreen if I am outdoors all day?

You should reapply sunscreen every one to two hours if you’re going to be out in the sun all day. You should also reapply sunscreen after sweating a lot or if you’ve been in the water because even water-resistant sunscreens are not completely waterproof.

Dr. Ellen S. Marmur, MD
Dermatologist (Skin Specialist)

The sunscreen you put on your skin gets used up a lot more quickly than you realize, says dermatologist Dr. Ellen Marmur. To find out how often you should be reapplying sunscreen, watch this video.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.