Abstract: A decorative covering material and a process for applying said covering material to vehicle panels such as the roof panel of automobiles to enhance the exterior appearance thereof. The decorative covering material comprises a heat-softenable plastic sheet incorporating a coating of a heat-activatable adhesive over substantially the entire undersurface thereof and which sheet is pretrimmed to a preselected shape and size, and incorporates fastening strips along at least a portion of the terminal edges thereof for securing the decorative material over the panel to prevent movement thereof relative to the panel surface. The decorative covering material is further characterized as embodying, in the inner central area thereof, a contour and wherein the plastic material incorporates a residual memory whereupon a shrinkage of the covering materials occurs during a heating thereof to form a smooth and taut covering layer over the exterior surface of a panel to which it is applied.