Is there any way to use a blender or smudge tool in Painter to create a wispy/hairy feel without the white being added in like in my attachment? I really like what the Water Rake does, but as you can see, the white doesn't allow for much room to edit. So is there any way to drag out the paint without more paint being added in?

I don't want to use the Artist's Oils to blend since they can't rake.

Also, I know about the Underlying Color setting on layers, but I constantly change my background colors. =\

Thanks in advance!

EDIT: And the brown area is on a separate layer from the grey layer.