polysulfide corrosion inhibiting compositions used as adhesives and sealants for aircraft and military shelter industries are described as two - part compositions including a curing agent in the second part and a particular corrosion - inhibiting composition milled into the polysulfide in the first part where the corrosion inhibitors include a combination of a phosphosihicate with a mixture of alkali metal molybdate , ammonium benzoate , alkali metal nitrite , and benzotriazole .