A mercaptofunctional silane composition comprising at least one organofunctional silane having a chemical structure: [G 1 -(SiX α u Z β v Z θ w) s] m [ r -G 2 -(SiX α u Z β v Z θ w) s] n wherein: each occurrence of G 1 is independently selected from the group consisting of monovalent and polyvalent groups derived from an alkyl, alkenyl, aryl, or aralkyl having from 1 to 30 carbon atoms; each occurrence of G 2 is independently selected from the group consisting of divalent and polyvalent groups derived from an alkyl, alkenyl, aryl, or aralkyl group having from 1 to 30 carbon atoms; each occurrence of X α is independently selected from the group consisting of RO-, RC(=O)O-, -R, d-1 G 4 O-, HO(CR 0 2) f O-, HO(CR 0 2 CR 0 2 O) e -, wherein each R is independently hydrogen, or a straight, cyclic or branched alkyl, alkenyl, aryl, or aralkyl group having from 1 to 18 carbon atoms, each G 4 is independently a substituted hydrocarbon group having from 2 to 15 carbon atoms or a substituted heterocarbon group having from 4 to 15 carbon atoms and one or more etheric oxygen atoms, R 0 is independently given by one of the members listed for R, and the subscripts d, e and f are integers given by d is from 2 to 8, e is 2 to 7, and f is from 2 to 15; each occurrence of Z β, which forms a bridging structure between two silicon atoms, is independently selected from the group consisting of, [-OG 4 d-2 O-] 0.5, [-O(CR 0 2 CR 0 2 O) e -] 0.5 and [-O(R 0 CR 0) f O-] 0.5, wherein each G 4 is independently a substituted hydrocarbon group having from 2 to 15 carbon atoms or a substituted heterocarbon group having from 4 to 15 carbon atoms and one or more etheric oxygen atoms, R 0 is independently given by one of the members listed for R, and the subscripts d, e and f are integers given by d is from 2 to 8, e is 2 to 7, and f is from 2 to 15; each occurrence of Z θ, which forms a cyclic structure with a silicon atom, is independently given by -OG 4 d-2 O-, -O(CR 0 2 CR 0 2 O) e - and-O(R 0 CR 0) f O- wherein each G 4 is independently a substituted hydrocarbon group having from 2 to 15 carbon atoms or a substituted heterocarbon group having from 4 to 15 carbon atoms and one or more etheric oxygen atoms, R 0 is independently given by one of the members listed for R, and the subscripts d, e and f are integers given by d is from 2 to 8, e is 2 to 7, and f is from 2 to 15; each occurrence of the subscripts m, n, r, s, u, v, and w are integers independently given by m is from 1 to 20; n is from 1 to 20; r is from 1 to 3; and s is from 1 to 3; u is 0 to 3; v is 0 to 3; w is 0 to 1 with the provisos that u+v+2w=3 and the above structure contains at least one hydrolysable group, Z α or Z θ. each occurrence of G 1 is independently selected from the group consisting of monovalent and polyvalent groups derived from an alkyl, alkenyl, aryl, or aralkyl having from 1 to 30 carbon atoms; each occurrence of G 2 is independently selected from the group consisting of divalent and polyvalent groups derived from an alkyl, alkenyl, aryl, or aralkyl group having from 1 to 30 carbon atoms; each occurrence of X α is independently selected from the group consisting of RO-, RC(=O)O-, -R, d-1 G 4 O-, HO(CR 0 2) f O-, HO(CR 0 2 CR 0 2 O) e -, wherein each R is independently hydrogen, or a straight, cyclic or branched alkyl, alkenyl, aryl, or aralkyl group having from 1 to 18 carbon atoms, each G 4 is independently a substituted hydrocarbon group having from 2 to 15 carbon atoms or a substituted heterocarbon group having from 4 to 15 carbon atoms and one or more etheric oxygen atoms, R 0 is independently given by one of the members listed for R, and the subscripts d, e and f are integers given by d is from 2 to 8, e is 2 to 7, and f is from 2 to 15; each occurrence of Z β, which forms a bridging structure between two silicon atoms, is independently selected from the group consisting of, [-OG 4 d-2 O-] 0.5, [-O(CR 0 2 CR 0 2 O) e -] 0.5 and [-O(R 0 CR 0) f O-] 0.5, wherein each G 4 is independently a substituted hydrocarbon group having from 2 to 15 carbon atoms or a substituted heterocarbon group having from 4 to 15 carbon atoms and one or more etheric oxygen atoms, R 0 is independently given by one of the members listed for R, and the subscripts d, e and f are integers given by d is from 2 to 8, e is 2 to 7, and f is from 2 to 15; each occurrence of Z θ, which forms a cyclic structure with a silicon atom, is independently given by -OG 4 d-2 O-, -O(CR 0 2 CR 0 2 O) e - and-O(R 0 CR 0) f O- wherein each G 4 is independently a substituted hydrocarbon group having from 2 to 15 carbon atoms or a substituted heterocarbon group having from 4 to 15 carbon atoms and one or more etheric oxygen atoms, R 0 is independently given by one of the members listed for R, and the subscripts d, e and f are integers given by d is from 2 to 8, e is 2 to 7, and f is from 2 to 15; each occurrence of the subscripts m, n, r, s, u, v, and w are integers independently given by m is from 1 to 20; n is from 1 to 20; r is from 1 to 3; and s is from 1 to 3; u is 0 to 3; v is 0 to 3; w is 0 to 1 with the provisos that u+v+2w=3 and the above structure contains at least one hydrolysable group, Z α or Z θ.