Thistle Bonding Coat is an ideal base coat plaster for smooth or low suction backgrounds such as tiling, concrete, plasterboard or surfaces treated with Thistle Bond-it. The fine mix allows for improved workability, making it easier to spread, rule and Darby. Thistle Bonding Coat is a lightweight, retarded hemihydrate that is pre-mixed gypsum plaster incorporating exfoliated vermiculite aggregate, which only requires the addition of clean water to prepare it for use. With a final coat of any Thistle finish plaster, Thistle Bonding Coat provides a smooth, inert, high quality surface to internal walls and ceilings, and a durable base for the application of decorative finishes.