In my quest to search for the perfect mascara, I discovered MAC Prep and Prime Lash primer. MAC Prep and Prime really does what it’s supposed to. This lash primer goes on white and dries to almost clear and helps your mascara stick and build to your lashes. And best of all, it helps to make your mascara last longer too! I tested this product, and put it on underneath my Diorshow Unlimited mascara. MAC Prep and Prime made my mascara last through the gym and a long, hot day. I’ve gotten so used to the thick, full lashes MAC Prep and Prime help to give me that I can no longer wear just mascara alone. MAC Prep and Prime not only works, but costs half as much as Lancome’s lash primer. You can wear MAC Prep and Prime under any kind of mascara and you don’t have to let it dry before applying mascara on top.