Hi, I am new to ZBrush, and I got stucked with a problem, I am working on some kind of creature and I would like to split mesh to polygroups using polypint - paint different colors for different body parts. But I simply cannot do a sharp borders between polypaint colors on the mesh. Dont know, if my english is enough to descibe this situation precisely 
I have read an advice to use pen A brush, but that doesnt work on my ZBrush 4r4, the adjacent colors are still blending, which leads to multiple polygroups created in those areas. I have tried all the brush settings set do different values, but no effect, so I came here for an advice, thank you very much.