A method of coating a substrate comprises the steps of: supplying a substrate, applying at least a base layer of a first curable substance having a viscosity of 1000-10000 cP at 25 °C on the substrate, applying at least a cover layer of a second curable substance having a viscosity of 100-2000 cP at 25 °C on the base layer, wherein the cover layer is thicker than the base layer, wherein both the first and second substances comprise polyurethane acrylate and reactive diluent.