A method for forming a closed frame-shaped spacer for an insulating glass pane by applying a paste-like and subsequently hardening strand has at a beginning of the strand a ramp in which the thickness of the strand increases from zero to a nominal thickness. An end of the strand's thickness is complementary to the rising ramp on the same path, overlapping the ramp, decreasing from the target thickness to zero, the surface of the ramp forming an interface between the beginning and the end of the strand. The beginning and end of the strand are pressurized on either side by placing it between a first jaw and a second jaw. The exerting surface of the first jaw has a property enabling the material of the strand which comes into contact with the surface of the first jaw to be removed therefrom by lifting the first jaw from the strand.