a method for producing a polymer mirror by continuously manufacturing a polymeric substrate , applying a reflective layer or layers which may be a polymer whose surface has been metalized so as to make it reflective or a multi - layer film wherein the combined refractive indices of the layers give the quality of a mirror surface . an optional coating may be applied to a surface of the reflective layer to promote adhesion to the underlying substrate . a composite is formed by heat lamination using a calendar roll assembly to fuse the layers into a rigid final article having a reflective surface having the character of a silver mirror , a highly reflective mirror , or a colored mirror .