SITE BOOK - Plaster systems - British Gypsum

Technical support: T 0844 800 1991 F 0844 561 8816 E bgtechnical.enquiries@bpb.comInstallationPlaster systems11MixingUndercoat plasters are pre-mixed withaggregate. Add only clean water toprepare them for use.• Mix by hand or mechanical whisk (avoidexcessive mechanical mixing).• Use only clean water and clean mixingequipment.Contamination from previousmixes can shorten the setting time andreduce the strength of the plaster whenset.• Use plaster projection machines whereappropriate.Thistle Hardwall, Thistle ToughCoat and Thistle Universal One Coatplasters can be mixed / applied usingplaster projection machines.Solid backgrounds• Apply undercoat plaster with firmpressure.• Build out to the required thickness insuccessive coats of approx. 8mm.• Wire scratch each coat and allow to setbefore applying the next.• Rule the final coat to an even surfaceand lightly scratch to form a key for ThistleMulti-Finish or Thistle Durafinish.9423