I've been working on three panel paintings. I became rather frustrated that the paint layers were not providing the opacity I desired, not to mention that I'd used quite a lot of white paint when making tints....until I realized that the Windsor & Newton Finity Mixing White acrylic I've been using is, well, translucent.
I don't have any Titanium White acrylic, and it would take at least two weeks to get it shipped, cleared through Customs and then on to my courier service mail box. So I'm making do with the Mixing White--which really is quite buttery and lovely, by the way. It's just not what I'd prefer for these panels.