The routine that works for me really well (and I am an oil slick!) is: moisturize skin after cleansing with Clean and Clear Soft with SPF15, prep skin with Monistat Anti-Chafing Gel, and then apply my Every Day Minerals foundation followed by their finishing dust. Then I just carry around a mini sample jar of foundation for quick touchups. The most important thing for me is to let my skin completely dry in between the moisturizer, prep, and foundation steps. I really do think a really important step people with oily skin forget is to moisturize--it helps cut down on the oil your skin wants to produce all of the time.