Paintstormstudio.com

If someone understands how to use this feature, please post some links of a tutorial etc. I would like to have a brush that uses the primary and the secondary colors in the color wheel, in such a way that the top color of a brush stroke uses one of these colors and the bottom color of a brush stroke uses the other color. In this way a brush stroke might look 3D, of thick, casting a shaddow.

Best regards,
Donald

This made by seting gradients colors, You can choose the main and second colors in gradient points.
But you must understand that double brush overlay 2 shapes every "tick" - it's not a "stroke over stroke" but "spot over spot" so if you need "stroke over stroke" the only way is to increase stabilizer for a second stroke. Another usage is to enlarge the second brush with an empty inner area (works better for flat brushes)