Physical properties of sodium silicate-based substances make them very attractive for commercial/industrial use. Liquids and solids based on sodium silicate and produced by PQ Corporation have a density from 1.6g/cubic cm. to about 1.4 g/cubic cm.
A very big difference between acrylic and oil paint is the drying time. Acrylics dry in a matter of minutes to hours and oils dry in a matter of hours to weeks! This is a huge factor when choosing whether or not to choose oils versus acrylics.
With watercolor and acrylics, the paint dries through evaporation, that is the water in the paint is lifted out by spontaneously turning from a liquid into a gas, and the paint hardens. The hotter it is, the faster this happens. With traditional oil paint, there isn't any water in the paint to evaporate.