@Wayne: First I applied a white layer of acrylics. I believe I did that to only one of the sleeves. On the other one I went straight with titanium white. I did this because the sleeves have a very 'rough' texture and got bored with all the acrylic layers (yes, I know itr sounds insane). I am still trying to grasp the dillutions of oils too. So in general I do this: I apply the first layer of oils. Then I put the piece under the lamp for 30' sessions, perhaps two or three at a time (because I mainly work late at nights I don't have that much time). And usually I start a new paint session either the next day or the day after the next. So I really can't tell you if it's strictly wet-on-wet. I guess the answer is no, because at some point the layers lose their coverage when the oils are all wet and I have to stop. What I noticed is that I can't let it dry for many days, let's say a week. It happened. Then I had to re-apply a white layer and re-paint the grays. I think that I applied at least 3 times the white layer and the gray... hope it helps...others can weigh in and give some solid advise on how to dillute the oils...would appreciate it too...