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British Gypsum Thistle Bonding Coat is a gypsum undercoat plaster for use on low suction backgrounds, e.g. some brickwork, blockwork or concrete, Gyproc plasterboard, expanded metal lath, or surfaces treated with bonding agents. With a final coat of Thistle Multi-Finish, 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. Thistle Bonding Coat is a lightweight, retarded hemihydrate, pre-mixed gypsum plaster, incorporating exfoliated vermiculite aggregate, requiring only the addition of clean water to prepare it for use. PLEASE NOTE :- Return Policy on plasters : Due to the volatily of plaster products, once delivered or collected we regret that we are UNABLE to accept materials back for credit. .