Browning plaster is an undercoat plaster, for application on more permeable surfaces. It is a type of Thistle plasters and made by British Gypsum, less expensive and the best.
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This is a type of plaster that is usually used in renovation projects as these houses are nearly all dry lined with plasterboard. Browning plastic are wet trades and if they are applied on walls it will takes months for them to dry out properly. Anyone using browning plaster on a full wall requires to be properly skilled.