Method for establishing of erosion resistant surface part on a wind turbine blade, method for creation of an erosion resistant coating, wind turbine blade with retrofitted coating in and around areas where the blade is especially exposed to erosion damages, coating for mounting on a wind turbine blade's front edge

A method for establishing of an erosion resistant surface part on a wind turbine blade (25), said method comprising:

• a) making a plug (6) of an outer geometry of a surface of the wind turbine blade;
• b) orientating the plug (6) in a room such that a front edge of the plug faces upwards, whereby a tangent (20) to the front edge forms a horizontal line and touch points between horizontal tangents (20) and the plug (6) form a front edge line (21);
• c) coating the plug (6) with a release agent and/or other surface treatment, which allows casting on, and subsequent demoulding from, a surface of the plug;
• d) forming an erosion resistant coating by casting a cohesive glass fibre mat on the plug (6) across the front edge line (21) and a predetermined length from the front edge line and down along two sides of the plug;
• e) after casting the cohesive glass fibre mat on the plug, casting at least one layer which includes a hardening polymer directly on the plug after the following steps:
• 1) plentifully dosing a non-fibre polymer along the front edge line (21) of the plug down in/on the glass fibre mat such that the non-fiber polymer runs out of the glass fibre mat and down along the two sides of the plug,
• 2) burnishing a transition between the glass fibre mat and the non-fibre polymer,
• 3) waiting a necessary amount of time for polymerisation to take place, thereafter repeating steps 1, 2 and 3 until a predetermined layer thickness is created and forming non-fibre layers (2, 3, 4);
• f) ejecting the erosion resistant coating (10) from the plug (6);
• and
• g) glueing the erosion resistant coating (10) onto the surface of the wind turbine blade as the erosion resistant surface part, placing a front edge line of the erosion resistant coating level with a corresponding front edge line of the wind turbine blade.