NOVELTY - The arrangement comprises a plastic tape. The plastic tape is arranged at specific locations of a blade to reinforce a blade-surface (BS), comprises a sandwich structure, a first layer, a second layer (L11) placed on a first side of the tape and a third layer arranged on a second side of the tape. The first layer comprises a carbon fiber (L21), which is used for reinforcement purposes of the tape. The first side is aligned to an ambient of the blade. The second layer is connected with the first layer, and comprises a pure thermoplastic fluoropolymer.    USE - The arrangement is useful for improving a surface of a wind turbine blade.    ADVANTAGE - The arrangement improves erosion resistance and aerodynamic characteristics of the blade thus enhancing lifespan and output-power of the wind turbine.    DETAILED DESCRIPTION - The arrangement comprises a plastic tape. The plastic tape is arranged at specific locations of a blade to reinforce a blade-surface (BS), comprises a sandwich structure, a first layer, a second layer (L11) placed on a first side of the tape and a third layer arranged on a second side of the tape. The first layer comprises a carbon fiber (L21), which is used for reinforcement purposes of the tape. The first side is aligned to an ambient of the blade. The second layer is connected with the first layer, and comprises a pure thermoplastic fluoropolymer. The third layer is connected with the first layer, and the second side of the tape is arranged opposite to the first side of the tape. The first and third layers of the plastic tape are prepared to be connected with the blade to improve the blade surface. The connection is established by a liquid adhesive (ADH) applied. The plastic tape is arranged: within a mold to become an integrated part of the blade-surface; at locations of the blade, where ambient influence leads to erosion the blade; close to and/or along the surface of a leading edge of the blade; and inside the mold before applying a matrix material to cast the blade. The mold is prepared and arranged to be used within a vacuum assisted resin transfer mold process. The first and second layers are connected by applied heat and/or pressure.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a blade surface.    Second layer comprising polyvinylidene fluoride (L11)    Carbon fiber (L21)    Layer comprising polyurethane (L31)    Adhesive (ADH)    Blade surface. (BS)