Have tried MANY primers. I have sensitive oily/acne prone skin with large pores (that is also prone to surface dehydration). I wash, and after toner dries I apply this. After about an hour the natural oils in my skin blend with this and it becomes the perfect moisturizer, giving sun protection & keeping shine at bay. I usually dont wear foundation over this, just a light dusting of semi-sheer powder. It gives my skin a more smooth look & feels amazing/soothing. Love all the PC products I have tried.