The Vienna Waterworks operate approximately 800 km cast iron pipes, which have an average age of 80 to 100 years. The proportion of these pipe lines in the total pipeline network with a length of about 3600 km can not be neglected. About 300 to 400 km of these cast iron pipes are connecting pipes for drinking water. In spite of the long service life these cast iron pipes are metallurgically and chemically still in a good condition. The problem with these pipes are the joints (socket area) that are leaking over the years. This results on the one hand in non-negligible water losses, and on the other hand in an erosion of the pipe bed with the risk of more frequent pipe bursts in this area. As a remedial measure primarily the subsequent bridging of the leak of pipe joints is considered as a new piping is hardly possible in many cases. Moreover, large connections are likely to cause significant costs. Despite some previous pilot projects of the Vienna waterworks a sustainable rehabilitation method to seal the leaks could not be developed. In the literature, numerous methods for the rehabilitation of pipes for drinking water, which are also relevant for the present case, are described. However, virtually the methods used so far do not represent a satisfactory solution to the problem at the long run. From a material point of view the challenge of the current project is the rehabilitation of local leaks in the joints and not of the entire pipe. Since the leaks have to be currently repaired by workers in relatively limited space in the pipe itself, the use of an unmanned robot, is sought. Therefore, the formulation must be mechanically applicable. Another challenge are the requirements on the material resulting from the application field itself: the materials used must last for 50 years and satisfy the conditions of use for drinking water.