Abstract: A fastener has a head with an exterior end surface and a compression ledge. A projection extends from the compression ledge and a contact shoulder is formed at an intersection of the projection and the compression ledge. The shoulder has a thickness measured axially from the compression ledge and extends radially outward from the projection to the intersection of the shoulder and the compression ledge. A compressible sealing component encapsulates the exterior end surface of the head and partially overlaps an area entirely around the compression ledge. The compressible sealing component at the area of the compression ledge has an uncompressed axial thickness greater than the shoulder thickness measured from the compression ledge. A rotation preventer is formed on the projection and is configured to allow axial movement of the projection into a hole and to restrict rotation of the fastener when the projection extends into the hole.

Abstract: A method for bonding sidewall panels each comprising first and second skins and a core member sandwiched therebetween. The first skin has a main portion and an overlapping portion extending beyond the core member. The second skin has a main portion and an overlapped portion not extending beyond the core member. The method comprises the following steps. First, an entire exterior surface of the first skin and only an exterior surface of the main portion of the second skin of each of said sidewall panels are painted. Then, the sidewall panels are oriented such that the overlapping portion of the first skin of one sidewall panel is planarly aligned with the overlapping portion of the second skin of another sidewall panel. Next, the overlapping portion of the first skin of one sidewall panel is adhesively bonded to the overlapped portion of the second skin of another sidewall panel.