PLEASE NOTE: Due to import restrictions, it is not possible to ship this item outside Ireland.Primer for smooth, non-oily supports and a universal primer for porous supports (soft wood, stone, plaster, cardboard)Titanium white and acrylic resin baseImpermeable, supple, adheres well (perfect adherence on smooth supports).GESSO also contains calcium carbonate, which makes it rough and opaque, and is used to cover a dark background, onto which you can apply light colours.