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Problem Solver - Distemper
Other Problems
Form of whitewash normally made using chalk or lime and a size in extreme cases lead was also used . You can identify by wiping your hand over the surface, is a white powder is present it is likely to be distemper.
Preparation
Wash the surface with clean water to remove surface powder.
If mildew is present use a fungicidal wash to manufacturers recommendations.
Basecoat
Once the surface is clean and all loose material has been removed, treat with an Alkali Resisting Primer or suitable plaster primer and allow to dry.
Topcoat
Apply a suitable topcoat.