Think of these products like the primer you'd use for painting a
house. The goal is the same: to fill in any bumps, lumps, and uneven
spots so that whatever you put on next starts on a smooth, even surface.
In the case of your face, that would be concealer, foundation, or
Many people find primers to be especially useful around the eyes, where fine lines can become more prominent when makeup
settles into the crevices, as well as in areas with enlarged pores.
When you use a primer on areas that tend to be oily, like the eyelid,
makeup tends to adhere better and last longer. Also, a thin layer of
primer all over can help makeup stay put.
Another primer perk: Whether your skin is oily or dry, acne-prone or sensitive, you can use a primer, since the moisture it imparts comes via silicone, not oil.