Prep + Prime Skin is a lightweight gel lotion formulated with special-effect silicones. It evens out skin redness and skin tone while adding radiance and improving the laydown and application of foundation or powder.How to use: Smooth evenly all over your face or to desired areas, after your moisturizer but before your foundation. Apply with your fingertips, a sponge or a brush. Brand: M.A.C.. Style Name:Mac Prep + Prime Skin. Style Number: 155284. Available in stores.