This technique of laser annealing was therefore applied to the case of the WLE material, COP. After that, the homogeneity as well as the reactivity of the coating were investigated using a test reaction, namely the decolorization of methylene blue and a photocatalytic reaction, the reduction of nitrobenzene to aniline . At last, this coating technique was transferred to the WLE which was accompanied by the additional challenge of the complex spherical geometry.