Silibond Si-720 stabilises weathered and worn building materials and protects them against acid rain. The organic silica impregnation material penetrates deep into the structure where it replaces the missing binding agents which get lost over the time. The capillaries suck the material deep inside where it transforms into a natural high efficient binding agent. SiliBond Si-720 doesn´t create a film or a shell on the surface, the building material is still breathable after treatment. The 1 component system, doesn´t change the appearance or the colour. Historical buildings, natural stones, frescos, stuccos and clay brick are the main application areas. SiliBond Si-720 is suitable for sand stones too. The strengthening effect develops over 2 week´s time.