Excellent in physical properties such as heat resistance, electrical properties, and the like, particularly excellent in surface appearance, and capable of continuously forming a polymer layer containing a tetrafluoroethylene-based polymer with good productivity. A method for producing a long laminated substrate having a substrate layer and a coating layer for forming a polymer layer on the surface of the substrate layer by melting and firing, comprising applying a dispersion containing particles of a tetrafluoroethylene-based polymer and a liquid dispersion medium to the surface of the long substrate by applying a specific reverse coater method, wherein the viscosity of the dispersion is 100 5000 MPa.s and the 45 MPa.s of the polymer is contained in the polymer, And the width and surface hardness of the gap between the rolls are specified conditions, Manufacturing method. None

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