Abstract: The present invention relates to panels, panel systems and panel sealing elements, and may be useful for panels used in building. The invention may be particularly useful for panels used on existing walls to provide a desired structural appearance or effect. According to an aspect, the present invention provides a panel for providing a selected structural appearance, the panel comprising a support layer formed from a rigid material, an outer layer comprising elements which provide the selected structural appearance, the outer layer formed from a material different from the support layer material, and a mid-layer between the support layer and the outer layer, wherein the mid-layer allows for different thermal expansion and contraction rates of the support layer material and the outer layer material.