I've got some green acrylic paint in a tube, and it says to thin with water. I figured that water doesn't evaporate as fast as some of the solvents that could be used, so I tried lacquer thinner first, that didn't work. Then I tried just paint thinner, that didn't work. The paint would not mix, it just stayed in a blob.
What would you say would thin this "thin with water" acrylic, besides water (smart asses). Mineral spirits? Acetone?