Durability of reinforced concrete structures can be considerably improved by appropriate surface technologies. Three different surface technologies are available at present, namely surface impregnation, sealing and coating. It is of utmost importance to make a clear distinction between these protective measures, as each one serves a distinct purpose. Water repellent surface impregnation of concrete is an efficient method to prevent chloride penetration into concrete. In this way service life of reinforced concrete structures in aggressive environment can be extended significantly. To achieve this goal it is mandatory to follow strict rules.