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National Spray Plaster Medium is recommended for internal applications to infill the surface imperfections and voids or to render large sections of concrete, brickwork or masonry by spray application. It can be applied as a base coat on location ground floor, basement or any upper deck of car park concrete walls and ceilings. It can be used up to 5mm thickness per coat to fill the voids or to level the surface imperfections. Always recommended as an under coat plaster.