TECHNOLOGY FOCUS - POLYMERS - Preferred Sheet: In the sheet (S1), the surface of the polymer support on which the undercoat layer provided is surface treated. The back sheet (S2) further comprises a barrier layer or a metal sheet. In the sheet (S2), the fluorine-containing polymer layer is disposed as an outermost layer. A colored layer is provided on one surface of the polymer support. A readily adhesive layer having an adhesive power of greater than or equal to 5 N/cm with respect to a sealing material is provided on a surface of the polymer support opposite to the surface on which the fluorine-containing polymer layer is provided. Another polymer sheet is attached, via an adhesive, to a surface opposite to the surface where the fluorine-containing polymer layer of the polymer sheet is formed. Preferred Method: In the method, providing of a polymer sheet involves applying a coating liquid containing the first binder on at least one surface of the polymer support; and drying the coating liquid containing the first binder on the polymer support. The forming of the fluorine-containing polymer layer involves drying the coating liquid applied on the undercoat layer to form the fluorine-containing polymer layer, and then curing the fluorine-containing polymer layer. Preferred Components: The polymer support has a terminal carboxyl group concentration of 4-15 mol/ton; a minor endothermic peak temperature Tmeta ( degrees C) of less than or equal to 220 degrees C as determined by differential scanning calorimetry (DSC); and an average elongation retention ratio of greater than or equal to 10% after storage for 72 hours under conditions of 125 degrees C and humidity of 100%. The undercoat layer has a thickness of 0.5-8 mu m, and the first binder contained in the undercoat layer is a silicone resin, a polyolefin, or an acrylic resin, polyester resin or polyurethane resin (preferably silicone resin) having a solubility parameter of 9.5-14 (cal/cm3)0.5. The undercoat layer contains a crosslinking agent (0.5-25 mass.%). The undercoat layer and/or fluorine-containing polymer layer has a crosslinked structure derived from a crosslinking agent. The undercoat layer contains a white pigment (4-12 g/m2). The fluorine-containing polymer layer has a crosslinked structure derived from a crosslinking agent. EXAMPLE - No suitable example given.