don't apply the MSF on top of a powder product, apply it on top of an emollient based product, namely, a liquid foundation, such as studio fix fluid. honestly, when using an MSF, i find additional powder to be overkill, usually. i'll apply studio fix fluid, possibly a blushcreme, then the MSF, and finish it off with a spray or two of fix+ directly onto your face. fix+ is honestly the best stuff ever, especially in hot, summery weather. another way to do it is to sweep your 187 (or whatever brush you use) through the MSF and pick up the desired amount of product, then spray fix+ onto the brush, which gives the MSF a slightly different, shimmery effect, but still makes it last forever.