There are brushes that add color if you repeatedly paint over the same area with the same pressure. And there are brushes that do not - amount of color just reaches certain maximum value and stays at it regardless of how much do you paint over that area with the brush and to add more color you have ...

If within the same stroke I paint over the same are over and over again with the same pressure there would be no addition of color. I can only add color if I start a new stroke. I wonder - is it possible to somehow make Paintstorm to continue adding color even within the same stroke?