Why does sunscreen only last a few hours?

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Seems to me like we should’ve easily invented something that lasts indefinitely by now

In: Chemistry

16 Answers

Anonymous 0 Comments

I think the real question is why can’t we make a sunscreen that lasts a whole day, long enough that you don’t need to actually reapply it for a whole day activity, instead of just two hours or being extremely difficult to remove without special chemicals, neither of which seems desirable.

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