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.
They are much easier to use and to clean up after. Canvas is elastic medium,mostly used for oil and acrylic painting,but you can use pigments with gum Arabic also.Oil demands more drying time,acrylic dries faster,and if you are starter i recommend you acrylic. Acrylic and oil paint. I would suggest acrylic because it is easier for beginners, dries much faster, and you can paint over it. oils or acrylics are perfect for canvas. Try this site, some real good tips! http://painting.about.com/od/paintingfor...