The product is just like eye drops, it comes out drop by drop and it's almost the same consistency too. It only takes a little bit- I'm about halfway through one bottle in six months, but admittedly it's not like I use it every day.
To show what it does, here I have used it with MUA "Eye Dust":
I dip the brush in the gel, then into the powder product. It works with any pigments, and even pressed powders as well. It turned the "eye dust" into basically a cream shadow:
You can still blend the product even when using it with the gel. You can use it to turn powders into eyeliners, and I don't find I need a primer, it stays put just fine without. I have a few of these sparkly pigments now, and I find it's much easier to use them with this gel first, rather than applying them on top of a sticky primer.