I have very oily skin. Literally an hour after applying powder I'll be back to a shiny mess if I'm not wearing PTR mattifying gel.
The directions say you can apply it under or over your makeup. When I first received it, I would always apply it under my makeup and it didn't really do anything. Then I started applying it over my makeup and what a difference! Now I don't leave the house without it on!
Maybe if your skin isn't as oily as mine this product will work okay if you put it under your makeup - but if that isn't working, don't give it, just try it over your makeup. Made a dramatic difference for me!