IPP's are pretty much highlighters for your skin that have glitter particles in them. It all depends on the color of it though for its use. For example, belightful I use as a highlighter for my cheeks for a glowy type look. And, sassed up from the fafi collection I use as a glittery glowy blush.
I use my 168 contour brush, 182 buffer brush or 129 blush brush .. maybe all together! I have combination skin but mostly dry on my cheeks. Try spraying fix+ or using strobe cream with it if it doesn't stick to it or if your face doesn't seem to agree with it!
All in all, I looove IPP's if you like some glitter with a mix of color and glow =) but that's my opinion.. Try getting a MA to try it on you
HOPE THAT HELPS A LITTLE!!