Basically, I got some large batches of acryllic paints and some ditilled water. Took the paint and cut it to a milky consistency using distilled water. Used an empty spaghetti jar (cleaned it thoroughly first) to mix in. Around 30-35 psi for the air brush worked very well. Two coats worked well, but I may add a 3rd for the base colour. My second colour I have yet to put on is a deeper blue. The base looks grey in the photos but it closer to space wolves grey.
I am painting 11 Leman Russ, a Basilisk, a Chimera, a Baneblade and a Marcharius Vanquisher this way.