An aqueous acrylic dispersion, formaldehyde and ammonia free. The 100% acrylic composition of the material, provides excellent resistance to ultra violet light, resulting in superior resistance to yellowing and chalking and excellent colour retention. Its glass transition temperature has been carefully selected to give the best balance of surface hardness and flexibility in order to achieve: very good dirt pick-up resistance, adequate flexibility to accommodate hair cracks in the substrates and possibility to be formulated with very low levels of volatile organic content. It is also proven, by years of natural exposure tests, that these coatings have good water vapor permeability, allowing the moisture (e.g. inside a building) to escape without causing blistering of the coating. Can be used as medium for colors, as binder for mortars and as a consolidant for also mortars, stone, ceramics, mosaics, frescoes etc.