I love this product! This is actually the only Mary Kay product I've ever tried and it's making me wonder what else I'm missing! My skin gets very oily before midday. I haven't found a product that helps much until I found this. This stuff is like magic. Ever since the first day I used it, it has kept me from looking greasy and shiny, all day long. It's by far the best oil controlling product I've come across so far. If you have oily skin, do yourself a favor and give this product a try! You only need to apply a thin layer and it does it's job! You still have a nice subtle glow without looking shiny or greasy. You don't need to use much, a small drop will glide across your skin and be all that you need. I'm not sure if this is considered a primer or not, but sometimes I mix mine with my primer or I'll put this on first and add some primer on top before I put on foundation.