Abstract: The invention relates to a method for manufacturing a profiled flexible bead (1) in a polymer material on a glazing (2) by encapsulation, the said device comprising a step of moulding, having brought at least one moulding element (3, 3?) into contact with the said glazing (2), by means of at least one sealing system (4), characterized in that at least one vent is formed inside the said sealing system (4).