Thistle ToughCoat and Thistle HardWall are gypsum undercoat plasters for use on most masonry. With a final coat of Thistle MultiFinish, Thistle ToughCoat and Thistle HardWall provide a smooth, inert, high quality surface to internal walls and ceilings. The combination has superior impact resistance, earlier surface drying, a higher than normal resistance to efflorescence, and gives a durable base for the application of decorative finishes. Thistle ToughCoat and Thistle HardWall are lightweight, retarded hemihydrate, pre-mixed gypsum plaster, incorporating special aggregates and additives, requiring only the addition of clean water to prepare them for use. These undercoat plasters are two of our products within our plasters range that is certified to BES 6001, achieving a rating of Excellent.