A method and system for the treatment of natural stone on finished surfaces

A method for the treatment of surfaces of natural stones, comprising prior impregnation of the stone in question by a silicate soln. made of sodium silicate, sodium-potassium or potassium. The phases are: application of a predetd. quantity of water to wet the surface of the stone to be treated; uniform distribution on the wet surface of a predetd. quantity of tetraethyloxysilane reagent, or TEOS; condensation of the reagent on the silicate used for the impregnation, with removal of the sodium and potassium atoms, in at least one external surface layer (T, Tm) of the silicate used for the impregnation and on the surface of the stone, with evapn. of the Et alc. created by the reaction. The system that applies the method comprises: a station for wetting and/or aspiration and checking the quantity of water present on the surface to be treated; a station for applying the reagent uniformly and in the predetd. quantity to the surface being treated, immediately after the said surface was treated at the previous station; a station for the condensation/evapn. immediately after the application of the reagent to the said surface at the previous station.