So this is my first model painted using Contrast.
Admittedly I didnt use the offiial undercoating, just good ol’ Halfords grey prime. Which didnt work so I started trying other things.
I can report that Army Painter White does OK as a base layer for contrast.
I also found that mixing contrast with a normal colour can give some interesting effects and provides a layering before you go in with the contrast on its own.
Finally I can report that Vallejo airbrush thinner works as a medium for contrast as well (we know its not just water, dont it had no ill effect).
I like contrast as another string to the bow but I am more comfortable with what I do in general. The cloth for instance is standard layer and wash.
More experimenting is needed and as I dont want to change mid-project. I think Slaanesh will be the first army that I go for a really good test of the paint.