Someone asked me this question last night, so I decided to blog it.
Based on my experience, you can't go wrong with:
Elf eyelid primer:
E.L.F , you can probably also find this at Target, or Walgreens, as I've seen elf in there.
They also have a mineral primer I want to try:
This one is $3. My sis uses this one, and she's very pleased with it.
Just like when preparing to paint walls in a room, or priming your nails before polishing, you should consider using a base on top of your primer. In my opinion, this is what makes your shadow pop, and it really looks vibrant and completes the look. I will do another blog on what bases I use and which ones I love. Basically a review...lol