The injection/filling method used must be proven to ensure that the cracks are completely filled with adhesive and that no adhesive can flow away during the curing process. Care must be taken to ensure a sufficient number of injection openings, venting openings must be arranged as required. When pressing with a hand lever press, a distance between the injection openings of between approx. 100 mm and 250 mm, depending on the thickness of the crack, and up to 300 mm in the case of cut cracks, has proved to be a good solution. With other pressing devices, larger distances can be selected if necessary, if it is ensured that a reliable distribution of the adhesive is achieved. If no filling nipples with non-return valve are used for pressing in the adhesive, suitable dowels must be kept available to close the drill holes. It is essential to ensure that both the filling nipples and the dowels seal the drill holes as tightly as possible so that the filled adhesive cannot flow out.