This specification covers filled, thermosetting resin compounds capable of being applied and cured in place between the surfaces of mechanically fastened (joined) structures. These products have been typically used as molded shims during assembly of aircraft components and parts requiring good flatwise compression properties and adhesion to metallic or nonmetallic materials, but usage is not limited to such applications. In most applications, the compound will be required to adhere to only one of the mating surfaces; i.e., the compound is not intended to be an adhesive. Each application should be considered individually.