Stay All Day Lash Mascara by Stila is an innovative, long-wearing mascara that contains a special polymer with an extremely high resistance to water. Stay All Day Lash Mascara is an innovative, long-wearing mascara that contains a special polymer with an extremely high resistance to water. The rich formula pumps up the volume of lashes, is buildable and unlike other waterproof mascaras, leaves lashes soft and shiny, yet will not smudge, budge or flake. The unique triangular brush expertly applies a generous coat of mascara for extreme volume and beautifully defined lashes.