What causes foundation settlement?

How do I avoid oily spots with my BareMinerals Matte SPF 15 foundation?

• I have been using the Bare Minerals Matte SPF15 foundation for around 4 or 5 months now and I love the coverage it gives me, but throughout the day my skin tends to get really oily, witch causes the foundation to get darker especially around areas where I have pimples and acne. It creates these really ugly dark spots on my skin that I HATE! I have tried and used the Original foundation and this happened as well, just not nearly as bad, but it didn't give the matte full coverage finish that I wanted. So what I'm asking is what the hell can I do to make this stop! I love Bare Minerals but I cannot stand this any longer. Also in case you need to know to prep my face I use Neutrogena acne cleansing wipes, the BareVitamins skin rever-upper, an SPF15 Up&Up moisturizer from target, and the Prime Time skin primer. Then I apply my foundation, bronzer, blush, eye makeup and so on. I really hope someone can help me with this! Thankyou to whoever does!!!!!!

• Answer:

  prime time is awful primer. if you don't have sensitive skin try smashbox photoready, and if you do have sensitive skin try rimmel fix and perfect PRO primer. for other stuff i recommend makeupforever hd powder for over your foundation. it is so fine and translucent, and it will get every spot of oil there without smudging makeup!