There's nothing more annoying than applying touch-ups all day because your face makeup is disappearing faster than Houdini. Such a waste of time! You're giving your foundation something to latch onto, she explains—and a good primer can even skin tone, camouflage pores, and help your makeup withstand the test of a sweaty commute or late night. But here's the thing: All face primers are not created equal. Think of priming as the last step in your skincare routine rather than the first step in your makeup application. Meaning, you should pay attention to your skin concerns when picking the right formula for you, just as you would when thinking about skincare.