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.
But acrylic has some advantages: 1  Acrylic dries quickly. 2  Acrylic can be diluted with water and cleans up easily. 3  Acrylic is more opaque than watercolor so I do not have to add as many layers. 4  I can get more realistic with acrylic. 5  Acrylic is not as toxic as oils (less fumes)