Here’s where people (me) might be cheating with tinted sunscreen or sunscreen makeup: you can’t be stretching it or sheering it, like you might a foundation. “When you’re using something like a tinted moisturizer with an SPF on the label, that’s a sunscreen,” Dr. Day explains, adding a disclaimer that it should be a mineral formula (zinc oxide) with SFP 30 or higher. “But if you think about how much you put on you face, you might not be putting on enough to be effective as a sunscreen. If you’re spreading a pea-sized drop all around your face, that’s like taking a fabric and stretching it really thin so that it’s not even really hiding anything, like wearing leggings that are thin and you can still see your butt through.”