PLATINA WeatherCoat PR300 is a water-based primer for exterior walls, formulated with special grade pigment that provides extra whiteness and opacity. It forms a tough film on the surface of the masonry, as a result provides longer life to the paint system. It is a suitable undercoat for exterior emulsions. It penetrates the porous surface of the concrete plaster, reduces absorption of the surface and as a result topcoat gives better coverage.