There are several uses for finishing powder. My reason is because I have normal to oily skin and the MMU I use is EDM semi-matte because I like the texture and coverage. To make it more matte and smooth I use EDM finishing powder after my initial a.m. application of EDM MMU, and later again in the afternoon as a touch up if I start to look shiney. Hope this helps. I know you'll get many more replies.