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1 Using expired sunscreen isn't as noticeable as drinking expired milk, but it can drastically reduce the sun protection you're getting. 2  It's best to discard expired bottles once they have reached the expiration date. 3  The downsides of using expired sunscreen are too high.
If you're in the sun, your sunscreen is good for a max of two hours, and depending on the sunscreen it might not even last that long, Garner says. The skin literally uses up the active ingredient in the lotion over time, meaning it can't do any more.urns out, there isn't such a thing as waterproof sunscreen. In fact, a relatively recent iteration of FDA rules no longer even allows the word to be used on sunscreen bottles (along with sweat-proof or sunblock). Instead, based on testing, they can claim to be water resistant for either 40 or 80 minutes.