What happens if you mix SPF 30 and 50?

But suffice it to say that if you mix sunscreen, the maximum SPF you'll get is the higher of the two you started with, she said. And you'll likely end up diluting it instead. In fact, if the two sunscreens use different active ingredients to protect you from the sun, they could end up compromising one another.



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The notion that you should apply two fingers' length worth of sunscreen is, in fact, a myth. This one-size-fits-all approach fails to account for the fact that individuals have different face sizes and hand sizes. Relying on such measurements can result in either insufficient or excessive protection.

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SPF50 should protect you 50 times as long as your skin would be able to naturally protect itself. However, remember that the lower the SPF and longer the length of time since application, the less UVB rays will be filtered, so a reapplication every two hours is highly recommended.

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