An apparatus and methods of sealing a metallic container with a metallic end closure are disclosed. The apparatus includes a tool operable to releasably join the closure to the container. In one embodiment, the tool is configured to form a thread in the closure and the container. The tool may optionally crimp the closure to the container. Once sealed, the container can be opened by rotating the closure in an opening direction. The closure can subsequently re-close the container by rotating the closure in a closing direction.