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I hope I don't sound silly, but I was just wondering...

When you put on a 15 SPF moisturizer, then a 15 SPF makeup foundation, does that mean that you have on 30 SPF?

I couldn't find any research on the topic, so any help would be greatly appreciated.

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No, they're not additive unfortunately. You apply an SPF 15 and an SPF 30, you've only got SPF 30. Two SPF 15's is still only SPF 15.

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No, they're not additive unfortunately. You apply an SPF 15 and an SPF 30, you've only got SPF 30. Two SPF 15's is still only SPF 15.

Shucks. Thanks for the tip! Spared me a sunburn...

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