A method of applying a protective sheet to at least a portion of an exterior surface of an article, the method comprising: - providing the protective sheet prior to forming at least one exterior surface of the article; and - integrally forming the at least one exterior surface of the article in the presence of the protective sheet in its formed form, such that the exterior surface of the article becomes adhered to the protective sheet with or without one or more additional layers therebetween; wherein formation of the exterior surface of the article in a mold involves curing a previously uncured material of the article to be protected, wherein the protective sheet comprises at least one of outwardly visible printed material and outwardly visible graphical material protected thereby, the printed and/or graphical material being pre-printed onto or viewable within the protective sheet prior to its bonding to the underlying article, the protective sheet is extensible and comprises a carrier and a topcoat, wherein both carrier and topcoat are polyurethane-based, wherein the protective sheet is 80 μm (0.003 inch) to 0.64 mm (0.025 inch) thick at its maximum thickness, and wherein the protective sheet fully covers the exterior surface of the article, characterized in that the protective sheet comprises an uncrosslinked topcoat. - providing the protective sheet prior to forming at least one exterior surface of the article; and - integrally forming the at least one exterior surface of the article in the presence of the protective sheet in its formed form, such that the exterior surface of the article becomes adhered to the protective sheet with or without one or more additional layers therebetween; wherein formation of the exterior surface of the article in a mold involves curing a previously uncured material of the article to be protected, wherein the protective sheet comprises at least one of outwardly visible printed material and outwardly visible graphical material protected thereby, the printed and/or graphical material being pre-printed onto or viewable within the protective sheet prior to its bonding to the underlying article, the protective sheet is extensible and comprises a carrier and a topcoat, wherein both carrier and topcoat are polyurethane-based, wherein the protective sheet is 80 μm (0.003 inch) to 0.64 mm (0.025 inch) thick at its maximum thickness, and wherein the protective sheet fully covers the exterior surface of the article, wherein formation of the exterior surface of the article in a mold involves curing a previously uncured material of the article to be protected, wherein the protective sheet comprises at least one of outwardly visible printed material and outwardly visible graphical material protected thereby, the printed and/or graphical material being pre-printed onto or viewable within the protective sheet prior to its bonding to the underlying article, the protective sheet is extensible and comprises a carrier and a topcoat, wherein both carrier and topcoat are polyurethane-based, wherein the protective sheet is 80 μm (0.003 inch) to 0.64 mm (0.025 inch) thick at its maximum thickness, and wherein the protective sheet fully covers the exterior surface of the article,