Benefit Stay Don't Stray

Benefit's Stay Don't Stray ($26) is a touted as a primer for both eyeshadow and concealer. This is my first time using a primer with this dual purpose. I must admit that I do not use it as a concealer primer. I am not sure why. Perhaps it has something to do with the fact that I don't have any issues with my under eye concealer creasing or fading as the day goes on or that a primer for your concealer sounds foreign to me.