I tried this and wasn't that impressed. All it did was give that slip to the skin which made applying the foundation easier. I don't have super oiy skin so I don't have issues with foundation melting off during the day. It might help with that, but I don't know. It certainly didn't do anything to improve the overall finish of my makeup, nor did it blur any pores or fine lines.
Most companies are making primers that do double duty (brightening, correcting, pore perfecting etc) And Monistat doesn't do any of those things, so sadly, this chafing gel has just been sitting there .... all alone, for about a year now.
I really wanted this to work to. I love it when I find an awesomely cheap dupe!