Abstract: A sealing kit and related methods of using for sealing gaps between two or more shipping containers that are used to form permanent or semi-permanent structures. The sealing kit includes a horizontal sealing material and a vertical sealing material, wherein the horizontal sealing material is essentially free-flowing and/or self-leveling and the vertical sealing material in nonflowable under the influence of gravity at typical installation temperatures above 32° F. The sealing kit further includes an expansion member for defining a retaining surface along an interface between adjacent shipping containers. The sealing kit can further comprise a plug member for defining drain holes at ends of a horizontal sealing surface.