Sappi Warren Release Papers provides the surface aesthetics found in synthetic fabrics, laminates, and split leathers. Sappis release paper is unique. It has the ability to replicate 100% of every pore and hair cell of an original hide or other material. It allows casters to create synthetic leather/fabric material that is visually indistinguishable from real leather and other natural materials. Sappi Warren Release Papers invented release paper over 50 years ago.