Material is sized with Lascaux Gesso Primer suitable for Acrylic and Oil painting. The Gesso is brilliant white, waterproof and non‐yellowing when dry. Acrylic Gesso creates a perfect white ground with a slight key that is flexible and has an inherent absorbency. Oil Primer Material is sized with C. Robersons Oil Primer which is an Alkyd based primer. Oil Primer creates a traditional and smooth painting surface with a titanium white ground. Oil primed surfaces are only suitable for oil painting.