Before I got all super into makeup, I had no idea what a makeup primer was. I had no clue; it seemed like such an 'extra' product that was not a necessity in my minimal kit. But I was wrong, so wrong. Primers have changed the way I use my makeup. I feel much better when out and about; that I don't have to be checking in the mirror every two seconds to see it I need a top up. A primer guarantees me a couple of hours before I even have to consider topping up.