MAC Macstack Legit Lift Lash Primer 12ml Add volume, length, lift and hold all day while reducing smudging with this ultimate primer formula that pampers your lashes. The formula is rich in castor seed oil and provitamin B5 to care for your lashes. With a brush shaped like a lash curler, M·A·C Stack Legit Lift Lash Primer offers customized lift and curl, no matter what type of lashes you have.