Ideal for us with raw canvas or wood, it can be applied to any porous surface including paper or panels. No prior sizing necessary. Permanent, non-yellowing and flexible when dry, primer is transparent to semi-transparent depending on the application. It can also be mixed with any acrylic paint to create a custom color background for oil, acrylic, or spray paint as well as dry media. Medium-coarse tooth is an excellent base for charcoal, graphite, pastel or color pencil.