Wind turbine blade repair method

The method of any preceding claim, wherein the method comprises the step of reducing the relative humidity of said defined curing region.

The method of any preceding claim, wherein said step of providing a temporary coating shield comprises:

• attaching at least one supporting arm or bracket to a surface of the wind turbine blade;
• and
• carrying a shield member on said at least one supporting arm or bracket to form said temporary coating shield.

The method of any preceding claim, wherein the method comprises the step of providing said at least one a temporary coating shield as a lightweight cover formed from a plastics or polymer material.

The method of any preceding claim wherein said temporary coating shield is formed from a relatively flexible material, such that the shield may be shaped to conform to the profile of the at least one supporting arm or bracket when mounted on the wind turbine blade.

The method of any preceding claim, wherein said viscous coating material comprises a polyurethane based material, preferably a polyurethane elastomer coating, preferably an aliphatic polyurethane.

The method of any preceding claim, wherein the method comprises the step of:

• preparing said section to be repaired to form a recess to receive a coating solution, and
• wherein said layer of viscous coating material is applied to said recess such that said coating material substantially fills said recess and is substantially flush with the surface of the wind turbine blade adjacent said recess.

The method of any preceding claim, wherein the method comprises the step of after said curing, smoothing the cured layer of viscous coating material.

The method of any preceding claim, wherein the method further comprises the steps of:

• after said applying said coating material, applying a layer of covering material over the exterior of said layer of viscous coating material, wherein said layer of covering material comprises a film of low surface energy material applied to the exterior of said layer of viscous coating material, and
• subsequent to said step of curing, removing said layer of covering material from said layer of coating material.