Oh, Stavros was just asking about color push, too...
This is about controlling the feel of the paint, color vs. medium, so to say. When you sketch, you might want to go above 100%, making the color push faster than the material and vectors. It's good for blending. When you want to do more watery stuff with a totally wet canvas, for example, go under 100% to get some interesting water color like effects. You can even go to 0% to just push bump around without changing the colors at all. Can be interesting, I thought. At the end, it's just a parameter I find interesting to explore, it still being a sandbox for me and all.
