SITE BOOK - Plaster systems - British Gypsum

www.british-gypsum.comPlaster systems1 19426• Apply Thistle Bonding Coat with firmpressure.• Build out to the recommendedthickness, rule to an even surface andlightly scratch to form a key for ThistleMulti-Finish or Thistle Durafinish.• Apply finish plaster once undercoat isset but not dry.• Thistle Durafinish requires ThistleGypPrime to reduce the suction. A mix of5 parts water to 1 part Thistle GypPrimeshould be applied to the undercoat plasterand left to fully dry prior to the applicationof Thistle Durafinish.One-coat hand plastering• Apply Thistle Universal One Coat withfirm pressure.• Build out to the recommendedthickness, rule to an even surface and fillin any slacks or hollows.• As the plaster stiffens, carry out furtherflattening and paring.• When the plaster is sufficiently firm, scourthe surface with a sponge float and wateras required, to raise ‘fat’ to the surface.• When sufficiently firm, progressivelytrowel the plaster to a smooth matt finish.Projection machine• Spray Thistle Hardwall, Thistle UniversalOne Coat or Thistle Tough Coat on to thebackground in the form of a ribbon.• The consistency should allow theribbons to run together.• When a substantial area has beencovered, work the plaster and rule as inhand plastering.It is easier to attain the requiredthickness of plaster in one application bymachine, but the total thickness shouldnot normally exceed 25mm, subject tobackground suitability.