If i apply a lotion with an spf 8 and then put an spf 15 on top of it, does that mean i’m actually wearing an spf 23?
SPF numbers don’t add up the way you might think. Using an SPF 8 and SPF 15 together won’t allow you to remain in the sun 23 times longer than without protection. It’s not an additive. You need to determine how long you’ll be in the sun, along with your skin type, and choose the appropriate SPF level for you.