This Microporosity product which is capillar, active impregnation and a high resistence polymer, is applied on the pourous surface. It penetrates deeply into the castings and impregnates fast. After curing it becomes resistant to thermal, physical and chemical strains. Microporosity Product is also monocomponent system. It can be applied by brushing or dipping. It allows a reliable impregnation. It impregnates form-looking and restores the pressure tightness of castings.