To insert the Spray-Liner® spray-head into the sewer pipe an access is needed. This access can be the venting opening, the connections of the sanitary facilities, the revision opening or the main sewer, from there the defective pipes will be renovated. Parts of a pipe or the whole pipe network can be rehabilitated. In particular a perfect bonding of pipe bends and side connections is achieved with this spraying method, thus water infiltration is no longer an issue. In the case an epoxy liner is already set in the main sewer, the milled side connections can be renovated with the Spray-Liner® method. Both methods can be applied in combination with each other.