So, I learned from the Aloysious painting that if you need to glaze acrylic paint over a dark background, the thing to do is not do it. Just don't. Ever. Mix your colors with black and paint direct, then apply straight color over that if you need to make it stand out a little more.
Not only will you accomplish the effect in a fraction of the time, (2 layers!) it will actually look the way you intended it to look.
If you really feel the need to glaze in acrylic for something other than minor touch-up, do it over a light background.
Here is Lucky, Branwen's cat who passed away in September.
I wanted to do matching Rainbow Bridge portraits for Drusilla and Branwen.
This weekend I will see Branwen and I'll give her the painting.
Lucky was much more cooperative than Aloysious...probably because he is a cat and they enjoy being admired.
5x7 acrylic on canvas panel