Abstract: A tool and a method are described for sheathing an elongated product available by the measured length, in particular in the form of a fiber or a fiber bundle, with at least one thermoplastic layer, with a wetting unit comprising at least one contact zone that can be filled with a flowable thermoplastic, through which the elongated product can be guided for the purpose of wetting with the thermoplastic in the form of a continuously progressing strand. The invention has a first feeding area for the elongated product and a second feeding area for the thermoplastic to emerge into the at least one contact zone. The contact zone comprises at least one outlet area and has a means is provided along the second feeding area, by which the thermoplastic can be introduced, subject to pressure, into the contact zone in the direction of the outlet area.