Every two hours is the rule, but set a timer.

Yes. Every two hours, no exceptions, even if it’s “water resistant.”

The two-hour rule exists because sunscreen breaks down from sweat, water, towel drying, and UV exposure itself — not just because you washed it off. Water-resistant labels only mean it holds up for 40 or 80 minutes while swimming or sweating, not that it lasts all day.

Reapply immediately after you get out of the water or towel off. And don’t trust the cloudy-sky trick — UV still gets through. Set a phone alarm. Your future sunburn will thank you.