Manufacturing process of a molded painted product comprising the following steps: - providing a sheet of a transparent plastic material with a first side and a second side, wherein the first side of the sheet has been painted by applying a layer of paint, - arranging the sheet in a cavity of a mold with the second side without the layer of paint directed towards the cavity of the mold, - fixing the sheet on the mold, - injecting or pouring a plastic material in the cavity of the mold, in such a way that the plastic material adheres to the first side of the sheet with the layer of paint, - extracting the air from the cavity of the mold to generate a vacuum in such a way that the second side of the sheet without the layer of paint adheres to the cavity of the mold; wherein said step of extracting can be performed before, after or during the step of injection or pouring, - polymerization of the plastic material in the closed mold, - opening the mold and extracting a product provided with a body of molded plastic material from the mold, wherein the first side of the sheet with the layer of paint adheres to the body of the product and the second side of the sheet is directed outwards, - providing a second sheet of a transparent plastic material with a first side and a second side, wherein the first side of the second sheet has been painted by applying a layer of paint, - arranging the second sheet on a lid of the mold with the second side without the layer of paint directed toward the lid of the mold, - fixing the second sheet on the lid of the mold, - pouring the plastic material in the cavity of the mold, - extracting the air from the lid of the mold to generate a vacuum in such a way that the second side of the second sheet without the layer of paint adheres to the lid of the mold; wherein said step of extracting can be performed before, after or during the step of pouring. - providing a sheet of a transparent plastic material with a first side and a second side, wherein the first side of the sheet has been painted by applying a layer of paint, - arranging the sheet in a cavity of a mold with the second side without the layer of paint directed towards the cavity of the mold, - fixing the sheet on the mold, - injecting or pouring a plastic material in the cavity of the mold, in such a way that the plastic material adheres to the first side of the sheet with the layer of paint, - extracting the air from the cavity of the mold to generate a vacuum in such a way that the second side of the sheet without the layer of paint adheres to the cavity of the mold; wherein said step of extracting can be performed before, after or during the step of injection or pouring, - polymerization of the plastic material in the closed mold, - opening the mold and extracting a product provided with a body of molded plastic material from the mold, wherein the first side of the sheet with the layer of paint adheres to the body of the product and the second side of the sheet is directed outwards, - providing a second sheet of a transparent plastic material with a first side and a second side, wherein the first side of the second sheet has been painted by applying a layer of paint, - arranging the second sheet on a lid of the mold with the second side without the layer of paint directed toward the lid of the mold, - fixing the second sheet on the lid of the mold, - pouring the plastic material in the cavity of the mold, - extracting the air from the lid of the mold to generate a vacuum in such a way that the second side of the second sheet without the layer of paint adheres to the lid of the mold; wherein said step of extracting can be performed before, after or during the step of pouring.