MAC MACStack Legit Lift Lash Primer Macy's MAC MACStack Legit Lift Lash Primer Macy's MAC MACStack Legit Lift Lash Primer Macy's MAC MACStack Legit Lift Lash Primer Ulta Beauty. Elevate your lash game with MACStack Legit Lift Lash Primer. This weightless, oil based formula not only boosts volume, length, and lift but also reduces mascara smudging and flaking for a flawless finish. Enriched with castor seed oil, vitamin E, and pro vitamin B5 derivatives, it conditions and strengthens your lashes while providing long lasting hold. Perfect for stacking under your favourite MACStack mascara, this primer transforms your lashes into a stunning, voluminous canvas.