answer: yes i do water down the paint. I can't tell you about the ratio/consistency: my english is not good enough to explain it clearly :\ But I can tell you to add a little bit of water for the first layer, and more for the 2nd, 3rd layers (and more and more).
But I can tell you to add a little bit of water for the first layer, and more for the 2nd, 3rd layers (and more and more).