A method for manufacturing a coated sheet, the method comprising - providing a sheet comprising cellulosic fibrous material, for example a sheet comprising paper and/or board, comprising a primer coating layer on the sheet, the primer coating layer comprising potato starch, inorganic filler and latex polymer(s) and having a grammage of the primer coating layer in the range of 1.0-5.0 g/m 2, such as 3.0-5.0 g/m 2, wherein said sheet comprising cellulosic fibrous material comprising the primer coating layer is obtained by - providing a sheet comprising cellulosic fibrous material, such as coated or uncoated sheet, for example a sheet comprising paper and/or board, - providing a first aqueous dispersion comprising potato starch in the range of 5-20% (w/w), 40% (w/w) or less inorganic filler, such as ground calcium carbonate, kaolin or talc, or a combination thereof, and 10% (w/w) or less latex polymer(s), for example in the range of 3-10% (w/w), and - coating the sheet comprising cellulosic fibrous material with the first aqueous dispersion to obtain the primer coating layer on the sheet, optionally repeating the coating at least once, to obtain a grammage of the primer coating layer in the range of 1.0-5.0 g/m 2, such as 3.0-5.0 g/m 2; - providing a second aqueous dispersion comprising potato starch in the range of 5-20% (w/w), and wax; and - coating the primer coating layer with the second aqueous dispersion to obtain a surface coating layer having a grammage in the range of 1-12 g/m 2, such as 4-7 g/m 2, optionally forming one or more fold line(s) to the coated sheet, preferably wherein the coating is carried out with a coating method selected from printing, such as printing by flexography or printing by gravure, air knife, curtain coater, blade coater, and rod coater, such as Mayer bar. - providing a sheet comprising cellulosic fibrous material, for example a sheet comprising paper and/or board, comprising a primer coating layer on the sheet, the primer coating layer comprising potato starch, inorganic filler and latex polymer(s) and having a grammage of the primer coating layer in the range of 1.0-5.0 g/m 2, such as 3.0-5.0 g/m 2, wherein said sheet comprising cellulosic fibrous material comprising the primer coating layer is obtained by - providing a sheet comprising cellulosic fibrous material, such as coated or uncoated sheet, for example a sheet comprising paper and/or board, - providing a first aqueous dispersion comprising potato starch in the range of 5-20% (w/w), 40% (w/w) or less inorganic filler, such as ground calcium carbonate, kaolin or talc, or a combination thereof, and 10% (w/w) or less latex polymer(s), for example in the range of 3-10% (w/w), and - coating the sheet comprising cellulosic fibrous material with the first aqueous dispersion to obtain the primer coating layer on the sheet, optionally repeating the coating at least once, to obtain a grammage of the primer coating layer in the range of 1.0-5.0 g/m 2, such as 3.0-5.0 g/m 2; - providing a sheet comprising cellulosic fibrous material, such as coated or uncoated sheet, for example a sheet comprising paper and/or board, - providing a first aqueous dispersion comprising potato starch in the range of 5-20% (w/w), 40% (w/w) or less inorganic filler, such as ground calcium carbonate, kaolin or talc, or a combination thereof, and 10% (w/w) or less latex polymer(s), for example in the range of 3-10% (w/w), and - coating the sheet comprising cellulosic fibrous material with the first aqueous dispersion to obtain the primer coating layer on the sheet, optionally repeating the coating at least once, to obtain a grammage of the primer coating layer in the range of 1.0-5.0 g/m 2, such as 3.0-5.0 g/m 2; - providing a second aqueous dispersion comprising potato starch in the range of 5-20% (w/w), and wax; and - coating the primer coating layer with the second aqueous dispersion to obtain a surface coating layer having a grammage in the range of 1-12 g/m 2, such as 4-7 g/m 2,