Well, I was just dying to try my new Winsor and Newton Artist Acrylics. They claim no color shift from wet to dry. This is my finding: They don't have color shift but I find that even the opaques are more transparent than they should be. Even the cads and titanium white. Also, when I squeezed my brand new cad red a lot of pure acrylic polymer fluid came out so there was separation. This was a brand new tube of expensive paint so maybe isn't binding as good as it should.
In spite of these cons I will give the W&N a second chance because I have been so dissapointed with the color shift in my Kroma Acrylics. It is most noticeable in my landscapes. I paint a nice bright sunny day painting and then when the paint dried it looks like I was painting an overcast day because of the acrylic paint darkenning as it dries.
When I left the Sketch Club I was decided upon wiping off the canvas when I got home to reuse it for better work. But as I was toting the painting across the parking lot my neighbor's little boy (5ish) said he really liked it. I take the opinions of children on art seriously so I'll not take the rag to it.
I'm practicing knife painting. I like the texture and my patrons are demanding empasto. Also, there's the bonus of not having to clean brushes. Knife painting is my new exciting challenge. If I can manage to master the technique I'll be forever content. (Maybe)