I'm trying to fill selected faces with color using the fill tool with face select mask toggled, but in the UV editor you can see that the fill is extending beyond the edges by quite a bit. I'm using Zero Brush here, but it happens in default Blender, too (ZB actually has a "fill threshold" option that lessens this problem but does not eliminate it.) Is there a way to stop the edges from bleeding over, period?
Edit: If the image is hard to see, full size is here overfill