A continuous self-metric method of forming a multi-layer film comprising at least two superimposed polymer layers comprises the steps of: providing a substrate; Providing two or more coating knives offset from the substrate independently of each other to form a gap perpendicular to a surface of the substrate; Moving the substrate against the coating knives in a downstream direction; Providing curable liquid precursors of polymers on the upstream side of the coating knives, thereby coating two or more precursors onto the substrate as overlapped layers through their respective gaps; Alternatively, providing one or more solid films and applying solid films essentially simultaneously with formation of an adjacent lower polymer layer; And curing the precursor of the multilayer film thus obtained, wherein the lower layer of the curable liquid precursor is covered by an adjacent upper layer of the curable liquid precursor or film, respectively, without exposing the underlying layer of essentially the curable liquid precursor.
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