Abstract: A method for mounting wall panels (1a,1b) to a wall (27). The method including providing first and having a thermoplastics substrate (3) and a protective film (7) applied over a major surface (11) of the substrate, said protective film (7) having a thickness of at least 140 ?m and including a textured surface (17) having a multiplicity of micro-peaks and/or micro-troughs randomly arranged, thereby providing a light diffusing and/or light scattering effect; mounting the first and second laminated wall panels (1a,1b) onto the wall (27); and inserting a gap filling sealant (21) into a gap between adjacent peripheral portions (29a,29b) of the first and second wall panels (1a,1b). A wall panel system is also disclosed.