The present invention relates to a method of overmolding at least one portion of seal (J) onto a peripheral part of a glazed element (V), said seal comprising at least one insert (1), this insert having an overmolded portion comprising a baseplate (2) and a projecting portion (4) oriented along an axis (A) for prepositioning, positioning or fixing the glazed element (V) in an aperture that it is to close, said method being characterized in that, during injection, the insert is positioned in the molding cavity using at least one pin (11) collaborating with a positioning means (5) situated on said overmolded part so that said baseplate (2) comprises, on a face facing toward the glazed element, at least one bearing tab (6) extending toward the glazed element and coming into contact therewith and, on an opposite face, a mount (3) having a free face supporting said projecting part (4) and which is not covered with the plastic of which the seal is made and in that during release from the mold, the mold is opened and the overmolded glazing removed without the projecting part (4) of the insert (1) coming into contact with the wall of said housing (10).