AhaBulbStuff Everyone Should Know
AhaBulb: Stuff Everyone Should Know · ahabulb.com/sunscreen-reapply

You're at the lake all day. How often should you put on more sunscreen?

Reapply sunscreen about every 2 hours, and after swimming or sweating, no matter the SPF.

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  1. About every 2 hours, and again after swimming or sweating ✔
  2. Once in the morning is enough if it's SPF 50 or higher
  3. When your skin starts looking a little pink

Why: Sunscreen wears off as you swim, sweat, and towel off, even the strong stuff. Put more on about every 2 hours, and right after you get out of the water. A grown-up needs about enough to fill a shot glass to cover the whole body.

Huh, didn't know that: A grown-up needs about enough to fill a shot glass to cover the whole body.

The dad joke
Why do bananas wear sunscreen at the beach? They peel easily.
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References

Answer: About every 2 hours, and again after swimming or sweating. Sunscreen wears off as you swim, sweat, and towel off, even the strong stuff. Put more on about every 2 hours, and right after you get out of the water. A grown-up needs about enough to fill a shot glass to cover the whole body.

  1. FDA: Sunscreen Requirements Questions and Answers www.fda.gov/drugs/understanding-over-counter-medicines/questions-and-answers-fda-announces-new-requirements-over-counter-otc-sunscreen-products-marketed-us
    Reapplying sunscreen, even if it is labeled as water resistant, at least every 2 hours.
    Checked 2026-10-09.
  2. American Academy of Dermatology: Sunscreen FAQs www.aad.org/media/stats-sunscreen
    When outdoors, reapply sunscreen approximately every two hours, or after swimming or sweating, according to the directions on the bottle.
    Checked 2026-10-09.
  3. American Academy of Dermatology: Sunscreen Amount Guidance www.aad.org/media/stats-sunscreen
    roughly the amount to fill a shot glass to fully cover skin not covered by clothing.
    Checked 2026-10-09.

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That's stuff everyone should know.