I've tried primers from Smashbox, Benefit, Vincent Longo, Mac, ect, and they all caused horrible acne breakouts on my face.  I'm a avid Bare Escentuals fan and over the past 4 years have learned that my skin will only tolerate their foundation on my acne prone skin.  I loved the idea of what primers do such as fill in large pores, evening out the skin's surface for easier makeup application, and it's ability to make your makeup last all day.  But no matter what primer I used, my face always reacted horribly to it and so I thought I would never get lucky enough to be a regular user of primer,...