There is a difference between "latex" and "acrylic" paints. Acrylic paints, like enamels form a film by chemical cross-linking of their polymeric (acrylic) components. Latex paints form a film by agglomeration. Latex paints are a suspension of a latex compound in water (with other chemical agents). As the water evaporates, the latex particles come together to form a continuous film. If you prevent too much of the solvent (water) evaporating, this cannot happen.

Acrylics form a film by polymer cross linking. The process will begin as soon as sufficient solvent is lost, generally a relatively small amount. You can slow the process by preventing solvent loss, but it will occur, and more rapidly than with a latex paint. Also, the chemical mixture of any paint tends to be hard on bristles. It's a good plan with rollers for latex paints, which can be a bear to clean adequately, but with acrylics there is significant hazard to the brush.