This gesso contains crushed marble, titanium white, and animal glue. It is meant to be applied over the layer of sizing. The sizing protects the canvas from oil, and the gesso lays down a highly absorbant coat for the painting base. Gesso is initially mixed with water, and when the glue is ready, linseed oil can be added. Please note: Fedex is the preferred shipping method for this item. See also CANVAS GLUE SIZING.