Method for sealing and/or reconditioning of pipes

A method for sealing and/or reconditioning of pipes (4) inaccessible from the outside due to location inside building elements, in the ground or the like, in which a fluid coating material is sprayed out of at least one nozzle (2) moved through the pipe towards the inner wall (3) of the pipe for covering at least parts thereof, and in which the material is then brought to harden for forming a part of the wall of the pipe where it has been applied, characterized in that the method is utilized for sealing and/or reconditioning of pipes having one or more substantial holes (12) though the pipe wall, that prior to said spraying at least one material piece (10) being divided in the longitudinal direction thereof and held together through means (11) to a pipe piece (17, 17′) with a smaller outer diameter than the inner diameter of the pipe is introduced into the pipe to a location for a substantial hole through the pipe wall for covering the hole, that the means for holding together is then broken so that the pipe piece increases the diameter thereof while releasing potential energy and will under pretension bear against the inner wall of the pipe, and that the material piece forming the pipe piece has no ability to seal said hole alone, but it forms in the subsequent spraying of coating material an auxiliary wall over the hole retaining the material sprayed within the pipe.