d comprises a compound of the general formula Rn --Si--(R1)4-n wherein R comprises a C4 -C10 alkyl group, R1 is a C1 -C6 alkoxy, halide, amino, carboxyl or a mixture of any of the foregoing and n is 1 or 2, or an oligomer of said compound; (b) an emulsifier or a mixture of emulsifiers having an HLB value of from about 1.5 to about 20; (c) at least one compound for buffering the pH of said composit