Described is an adhesive assembly containing a first adhesive and a second adhesive which is of a different strength or chemical composition than the first adhesive and positioned between the first and second adhesives is a barrier means for preventing contamination of the respective adhesives or the substrates to which they adhere wherein the combination of the adhesives includes a spongy or foam layer. Also described is a method of adhering together a plurality of substrates employing the adhesive assembly.