I splash my face with hot water between passes, but sometimes this thins out the lather on the 2nd and 3rd pass. Although it could be my lather technique, I'm still learning the ropes. So is it necessary to rinse your face between passes?
Sometimes yes. Sometimes no.
It all depends on the state the lather is in. If it is in need of more water then I will rinse and pick up a little water into the brush from my face. If everything is running smoothly, I'll just apply lather without a rinse.
I always rinse before my last pass to see what I have missed or what areas need more attention.