When would we use water or the spray to create foiling?

Q: When would we use water or the spray to create foiling?
A: Foiling, helps the pigment to bind together so it gives you a REALLY deep
dimension of the colors, and it really stays on well.
Spray the eye shadow brush with the misting spray,then pick up the eye
shadow and "paint" the eye shadow on for deep color dimension and lasting
power.
You can do the same with the eye liners to get a liquid eye liner look.

Credit Nicole Martin