Eli5: When you apply multiply products containing sunscreen of various SPF values, what would be the final SPF protection?

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Eli5: When you apply multiply products containing sunscreen of various SPF values, what would be the final SPF protection?

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The highest SPF you put on. Think of it like an umbrella covering your face. If you opened several tiny umbrellas and then opened a jumbo-sized one, you’d clearly get the most protection from the jumbo one and ignore the rest.