The basics SKIN Prep PRO™ is a clear, fragrance-free liquid for use on all skin types prior to makeup application.  The benefits Developed and used by industry professionals, it allows makeup to last longer under stressful conditions. The uses SKIN Prep PRO™ acts as a moisture barrier between the skin and your makeup to maintain that sought after fresh finish. The bottom line Use Mehron SKIN Prep PRO™ to help ensure your makeup application stays flawless throughout the day!