Thistle BoardFinish is a gypsum finish plaster for use on low-suction backgrounds. Thistle MultiFinish is a gypsum finish plaster for use on a wide range of backgrounds. Thistle BoardFinish and Thistle MultiFinish provide a smooth, inert, high quality surface to internal walls and ceilings, and a durable base for the application of decorative finishes. Thistle BoardFinish and Thistle MultiFinish are retarded hemihydrate, pre-mixed gypsum plaster, requiring only the addition of clean water to prepare them for use. These finish plasters are two of our products within our plasters range that is certified to BES 6001, achieving a rating of Excellent.