A SYSTEM AND METHOD FOR ATTACHING AN ADD-ON ON A WIND TURBINE BLADE

The present invention relates to a system for attaching an add-on on a wind turbine blade (2), comprising a wind turbine blade (2) having a leading edge (3) and a trailing edge (4), having a blade profile (5) between them, a first face (6, 7), a second face (6, 7), an application surface (8) at the leading edge (3) and/or at the trailing edge (4), a longitudinal extension extending from a root end of the wind turbine blade (2) to a tip end of the wind turbine blade (2), an edge centre (9) indicating a centre of the blade profile (5) along the longitudinal extension either at the leading edge (3) or the trailing edge (4), an add-on configured to be attached on the wind turbine blade (2) by an adhesive applied between an inside (10) of the add-on and the application surface (8) of the wind turbine blade (2), the add-on having at least one outer edge (14), a masking tape (20) to be detachably applied on the application surface (8) of the wind turbine blade (2) in a predetermined distance from the outer edge (14), a joint (19) made of a sealant provided at least between the outer edge (14) of the add-on and the masking tape (20), the joint (19) is formed to taper from the add-on towards the masking tape (20), wherein a masking film (21) is arranged so as to extend across the sealant at least during the forming of the joint (19).