Coated paper product and method and apparatus for the production thereof. The paper product comprises a base paper, the porosity of which is at least 300 ml/min (Bentsen) and at least one side of which is coated with a pigment-bearing coating layer. The coating layer according to the present invention comprises a homogeneous film, which is formed of binder and pigments and which is brought onto the surface of the base paper using curtain coating so that the variation of the grammage of the layer is less than 5%, and so that the coating layer is not penetrated into the base paper, in which case the coating layer covers at least 95% of the surface of the base paper. By means of the present invention such a good coverage is achieved that the porosity of the base paper does not affect the gloss or smoothness of the coated paper, nor how the paper functions as a printing base.