Abstract: A dispenser tool (42) is provided with multiple cartridges for dispensing viscous material onto the surface (5?) of a wind turbine blade (5). The dispenser tool (42) is advantageously part of a robot system used to work the surface (5?) of the blade (5). The system is configured for bringing the nozzle of a selected cartridge into the vicinity of the surface (5?) and orienting the dispenser tool (42) relatively to the surface (5?) such that the nozzle (46) of the corresponding selected cartridge (44) is at the surface (5?) for providing viscous material onto the surface (5?) from the selected cartridge (44) while moving the nozzle (46) along the surface (5?).

Abstract: A spreader tool is provided for spreading viscous material on the surface (5?), for example an edge (5?), of a wind turbine blade (5). The spreader tool (52) comprises at least one bendable spreader wing (54A, 54B), for example provided as a fin-ray construction, for pressing a flexible band (53) against a curved section of the blade (5) and for dragging viscous material along it by the flexible band during movement of the spreader tool (52) along the blade (5) surface (5?). The spreader tool is advantageously part of a robot system used to work the surface (5?) of the blade (5).