Processes comprising: providing an anion exchanger at least partially loaded with hexachlorostannate; and contacting the at least partially loaded anion exchanger with a 1 to 10 wt. In the method, veneers are conveyed through a compression gap made up by two press elements, the gauge of said gap being adjustable. The wind turbine blade is prestressed at a distance from the blade root in such a manner that the blade tip is brought closer to the longitudinal central axis of the blade root. Exposing a part to be plated to the solution enables reactive hydroxyl species to be generated and to texture the polymer surface.