A blocked mercaptosilane condensate comprising at least one component whose chemical structure is represented by Formula 1: l u (Formula 1) wherein each W1 and W4 fragment has at least one siloxane bond shared with another fragment, and wherein: u is any integer from greater zero to 10,000; l is any integer from 1 to 10,000; W1 is a hydrolyzable blocked mercaptosilane fragment represented by either Formula 2 or Formula 3: {[(ROC(=O)-) p (G-) j] k Y-S-} r G(-SiX 3) s (Formula 2) {(X 3 Si-) q G} a {Y(-S-G-SiX 3) b} c (Formula 3) W4 is a hydrolyzable alkyl silane fragment represented by Formula 6: Y 1 Y 2 Y 3 Si-R 2 (Formula 6) wherein, in the preceding Formulae 2, 3 and 6: Y is a polyvalent species z A(=E); A is selected from the group consisting of carbon, sulfur, phosphorus, and sulfonyl; E is selected from the group consisting of oxygen, sulfur, and NR; each G is independently selected from the group consisting of monovalent and polyvalent moieties derived by substitution of alkyl, alkenyl, aryl, or aralkyl moieties, wherein G comprises from 1 to 18 carbon atoms; provided that G is not such that the silane would contain an α,β-unsaturated carbonyl including a carbon-carbon double bond next to the thiocarbonyl group, and provided that, if G is univalent, i.e., if p is 0, G can be hydrogen; in each case, the atom A attached to the unsaturated heteroatom E is attached to the sulfur, which in turn is linked via a group G to the silicon atom; Q is selected from the group consisting of oxygen, sulfur, and (-NR-); each R is independently selected from the group consisting of hydrogen; straight, cyclic, or branched alkyl that may or may not contain unsaturation; alkenyl groups; aryl groups; and aralkyl groups, wherein each R, other than where R is hydrogen, comprises from 1 to 18 carbon atoms; each X is independently selected from the group consisting of -CI, -Br, RO-, RC(=O)O-, R 2 C-NO-, R 2 NO-, R 2 N-, -R, -(OSiR 2) t (OSiR 3), and (-O-) 0.5 wherein each R is as above and at least one X is not -R and at least one occurrence of X is (-O-) 0.5; R 2 is selected from the group consisting of hydrocarbon fragments obtained by removal of one hydrogen atom from a hydrocarbon having from 1 to 20 carbon atoms including aryl groups and any branched or straight chain alkyl, alkenyl, arenyl, or aralkyl groups; Y 1 is a moiety selected from hydrolyzable groups consisting of -Cl, -Br, -OH, -OR, R 2 C(=O)O-, -O-N-CR 2 2, and (-O-) 0.5; Y 2 and Y 3 are independently selected from the group consisting of hydrogen, the members listed above for R 2, and the members listed above for Y 1; and at least one occurrence of Y 1, Y 2, and Y 3 is (-O-) 0.5; a is 0 to 7; b is 1 to 3; c is 1 to 6; j is 0 or 1, but it may be 0 if, and only if, p is 1; k is 1 to 2; p is 0 to 5; q is 0 to 6; s is 1 to 3; t is 0 to 5; z is 0 to 2; provided that: (a) if A is carbon, sulfur, or sulfonyl, then (i) a+b is 2, and (ii) k is 1; (b) if A is phosphorus, then a+b is 3 unless both (i) c is greater than 1, and (ii) b is 1, in which case a is c+1; and (c) if A is phosphorus, then k is 2. u is any integer from greater zero to 10,000; l is any integer from 1 to 10,000; Y is a polyvalent species z A(=E); A is selected from the group consisting of carbon, sulfur, phosphorus, and sulfonyl; E is selected from the group consisting of oxygen, sulfur, and NR; each G is independently selected from the group consisting of monovalent and polyvalent moieties derived by substitution of alkyl, alkenyl, aryl, or aralkyl moieties, wherein G comprises from 1 to 18 carbon atoms; provided that G is not such that the silane would contain an α,β-unsaturated carbonyl including a carbon-carbon double bond next to the thiocarbonyl group, and provided that, if G is univalent, i.e., if p is 0, G can be hydrogen; in each case, the atom A attached to the unsaturated heteroatom E is attached to the sulfur, which in turn is linked via a group G to the silicon atom; Q is selected from the group consisting of oxygen, sulfur, and (-NR-); each R is independently selected from the group consisting of hydrogen; straight, cyclic, or branched alkyl that may or may not contain unsaturation; alkenyl groups; aryl groups; and aralkyl groups, wherein each R, other than where R is hydrogen, comprises from 1 to 18 carbon atoms; each X is independently selected from the group consisting of -CI, -Br, RO-, RC(=O)O-, R 2 C-NO-, R 2 NO-, R 2 N-, -R, -(OSiR 2) t (OSiR 3), and (-O-) 0.5 wherein each R is as above and at least one X is not -R and at least one occurrence of X is (-O-) 0.5; R 2 is selected from the group consisting of hydrocarbon fragments obtained by removal of one hydrogen atom from a hydrocarbon having from 1 to 20 carbon atoms including aryl groups and any branched or straight chain alkyl, alkenyl, arenyl, or aralkyl groups; Y 1 is a moiety selected from hydrolyzable groups consisting of -Cl, -Br, -OH, -OR, R 2 C(=O)O-, -O-N-CR 2 2, and (-O-) 0.5; Y 2 and Y 3 are independently selected from the group consisting of hydrogen, the members listed above for R 2, and the members listed above for Y 1; and at least one occurrence of Y 1, Y 2, and Y 3 is (-O-) 0.5; a is 0 to 7; b is 1 to 3; c is 1 to 6; j is 0 or 1, but it may be 0 if, and only if, p is 1; k is 1 to 2; p is 0 to 5; q is 0 to 6; s is 1 to 3; t is 0 to 5; z is 0 to 2; (a) if A is carbon, sulfur, or sulfonyl, then (i) a+b is 2, and (ii) k is 1; (i) a+b is 2, and (ii) k is 1; (b) if A is phosphorus, then a+b is 3 unless both (i) c is greater than 1, and (ii) b is 1, in which case a is c+1; and (i) c is greater than 1, and (ii) b is 1, (c) if A is phosphorus, then k is 2.