Yes, You Need To Let Sunscreen Soak In
Because water reflects UV rays, sunscreen is especially important for swimmers. But if you slather on sunscreen and immediately dive in, you might as well not wear sunscreen at all. If you don’t let it soak in, it’ll wash right off, says dermatologist Lisa Garner.
Queensland Health recommends waiting for 20 minutes before you jump into the water. The same goes for exercise; if you’re going to be sweating, let your sunscreen soak in. Reapply sunscreen every hour when you’re wet or in the water.
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