The naturally quick drying time of acrylics can also be of great benefit. Many of the most successful uses of acrylic paint come from people taking advantage of this property, which allows for painting over almost immediately. The unique acrylic glazing techniques, hard-edged applications and quick manipulation of the surface would not be possible without the very rapid drying of acrylic paint. Instead of fighting this characteristic, many artists have developed techniques to take advantage of it. To prevent paint from drying out in storage, be sure not to place it near blowers or heaters.
All plastic containers are slightly porous and allow a small amount of water vapor to escape.
Also, it is critical to clean the threads of lids and jars. If paint accumulates on these surfaces, the tops will not seal properly and the paints will begin to dry out. Some artists suggest spraying a small amount of water on top of the paint to keep the paint fresh. When spraying, use distilled or de-ionized water to avoid contaminating the paint. Paints will stay quite well in most basements, but should not be frozen.