Preparing a moulding containing an electrical switch comprises: (a) the preparation of a basis moulding from an active material (w.r.t. a current-free coating solution) comprising 100 pts. wt. thermoplastic olefin resin, 10-30 parts thermoplastic polyester resin and 2-10 parts active catalyst (w.r.t. the solution); (b) shaping the basis moulding into a finished article to form a surface that is coated with a material inactive w.r.t. the current-free coating solution, whilst leaving an exposed surface of active material in the basis moulding; and (c) coating the finished article without the use of an electrical current to form an electrical circuit switch on the exposed active material surface.
