We’ve all been there: Meticulously blending in your foundation for a natural finish, tapping in concealer where you like, and brushing some setting powder to complete your look. Despite all of this, you’re sometimes left with patchy foundation and makeup that seems to disappear from your face. The main culprit behind this is lack of skin prep so this week, we’re going back to basics and breaking down everything you need to do to prepare your skin before applying makeup.