Gamblin Rabbit Skin Glue provides a traditional size for fabric support. The size seals the porous fabric and isolates it from the ground and/or oil paints.
Conservation scientists caution painters that rabbit skin glue absorbs atmospheric moisture on damp days and swells and gives off moisture on dry days and shrinks. Aged oil paintings can be cracked by this movement of the glue. They recommend painters use a neutral pH PVA size on linen and canvas. Gamblin makes a PVA size.
Rabbit Skin Glue (RSG) is available in a 1 lb. bag.