Here is some general information on acrylic painting and its unique attributes. One of the most inviting qualities of acrylic paint is its easy clean up and vivid color. Unlike oils, acrylics can also be used on paper because they do not cause decay in natural materials.
Acrylics are pigment suspended in a polymer binder which can be dissolved in water before they dry.
After the surface of the paint has begun to congeal, the areas which are dry to the touch are permanent and can no longer be dissolved. Clean up tools and palette with soap and water. Always use synthetic bristle brushes with acrylics. Nylon brushes work well. Natural bristles will draw in the moisture which causes them to swell, then break down.