I am a big fan of Fyrinnae's Primer powder as well. As, it doesn't break me out either. I actually do use it along with foundation or sometimes by itself. And, I have used it as an eyeshadow base before even though I am a big fan of TooFaced's Eyeshadow Insurance and UDPP.
Now, to use Fyrinnae's Rice Powder Primer as an eyeshadow & face primer, here's I recommend you do so:
1. Buff a small amount of the Rice Powder Primer all over your face including your eyes.
2. Next, you buff your mineral foundation of choice all over your face, until you get the desired coverage that you need.
3. Take a cosmetic wedge and then dab it into the Rice Powder Primer jar. Once you have got a decent amount of Rice Powder Primer on the cosmetic wedge, then just press pat it all over each eyelid area. And, after doing so, then you can immediately begin to apply your eye makeup.