Abstract: A method and a device for coating an inner surface of a hollow endless geometry, in particular of a pipe/tube includes introducing a gas mixture comprising at least one precursor into the endless geometry, in which the endless geometry is passed through at least one electrode unit, in which an alternating electric voltage is applied to the electrode unit, so that the gas mixture inside the endless geometry is at least partially transformed into a plasma state in the region of the electrode unit. A reaction product is produced in the gas mixture from the precursor by the plasma and the reaction product is deposited on the inner surface of the endless geometry.