Seems to me like we should’ve easily invented something that lasts indefinitely by now
In: Chemistry
Based on what?
If you’re not swimming or sweating profusely or putting sunscreen on @ 4am you will be perfectly fine.
What you’re doing while wearing sunscreen is what matters, not the chemical composition of sunscreen. Forget hours, if you go into the water you may need to reapply immediately.
Max efficiency != doesn’t work at all
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