Repair of the damaged area of ​​the concrete window sill begins by knocking out old concrete. This will need a hammer and a chisel. Moreover, you need to extradite the edges of the window sill as even as possible. Try to do as little potholes as little as possible, the solution will still take the same. Now you will need to prepare a cement mixture. To do this, you need to mix strictly according to the instructions of cement with styrenbutadien-resin latex. It is better to prepare the solution in an old bucket or any other convenient capacity. And the finished solution is applied to the prepared area of ​​the window sill. But first, a piece of board is attached to the edge of the windowsill, and with the help of a trowel the selected area of ​​the windowsill is filled. The solution will need to be pressed a little with a trowel to fill all the potholes and cracks. In general, apartment renovation requires a lot of work and effort.