Hi Piter, in my opinion granulation can be very easily obtained with the help of the "Round" watercolor brush set up. Try to change the settings:
Spacing, 5, Vibration distances 25, Dissipation 25, Weight scale 25, disable random spatter. Water 0 or minimum size without tilt and experiment with these settings. In my opinion, it works on all types of paper.
Brush pressure is also important.
Greetings Andrzej
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