Read this tip to make your life smarter, better, faster and wiser. LifeTips is the place to go when you need to know about Sunscreen and other Beach topics.
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.
|Jennifer Mathes, Ph.D.|