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to plaster over dense concrete or old brick, the wall needs to be scuded (a slury type mix of one sand two cement dash on wall let dry for a few days ,scratch coat and then top coat

scratch coat as normal, let dry for a few days,plaster a light coat of rendering before dashing ,for a large job get an old bath for holding dash.mix enought to do job,the reason for bath is the dash will be the same colour when dry plus a wall uses a lot of of dash.you need a few...