Think of your face as a blank canvas or a painted wall. If you wanted to add color would you apply it directly to the surface or would you prime the area first to make sure you get long lasting and even results. Painting a wall is the same as applying make up to your face. If you don’t have an even slate your make up will not look good or lasts throughout the day. There are different primers for different skin types. Silicon-based primers work better with people who have combination to oily skin, and water-based primer’s work better with people who have normal to dry skin.