A epoxy-based composition comprising: (a) an epoxide resin having at least one 1, 2-epoxy group per molecule with an epoxide equivalent weight in the range of from 100 to 2000; (b) an amino-functional alkoxysilane; (c) a flexibilizer having the general Formula: wherein: each occurrence of R 1 is independently an alkyl group having from 1 to 6 carbon atoms, a phenyl group or an arenyl group having 7 to 12 carbon atoms; each occurrence of R 2 is independently an alkyl group having from 1 to 6 carbon atoms; each occurrence of R 3 is independently a phenyl group or an arenyl group having 7 to 12 carbon atoms; each X 1 is independently a hydroxyl group, an alkoxy group having from 1 to 6 carbon atoms, or an alkoxy group having from 1 to 6 carbon atoms and at least one ether or ester functional group; each X 2 is independently a hydroxyl group, an alkoxy group having from 1 to 6 carbon atoms, an alkoxy group having from 1 to 6 carbon atoms and at least one ether or ester functional group, or a group with the Formula: each occurrence of the subscripts a, m, n, p, x and y is independently an integer wherein a is 1 to 3; m is 0 to 500, n is 1 to 500, p is 0 to 10, x is 0 to 50, and y is 0 to 50 with the provisos that (i) the molar ratio of m to n is from 0 to 15, and (ii) the molar ratio of p to n is from 0 to 1; and (d) at least one curing catalyst. (a) an epoxide resin having at least one 1, 2-epoxy group per molecule with an epoxide equivalent weight in the range of from 100 to 2000; (b) an amino-functional alkoxysilane; (c) a flexibilizer having the general Formula: wherein: each occurrence of R 1 is independently an alkyl group having from 1 to 6 carbon atoms, a phenyl group or an arenyl group having 7 to 12 carbon atoms; each occurrence of R 2 is independently an alkyl group having from 1 to 6 carbon atoms; each occurrence of R 3 is independently a phenyl group or an arenyl group having 7 to 12 carbon atoms; each X 1 is independently a hydroxyl group, an alkoxy group having from 1 to 6 carbon atoms, or an alkoxy group having from 1 to 6 carbon atoms and at least one ether or ester functional group; each X 2 is independently a hydroxyl group, an alkoxy group having from 1 to 6 carbon atoms, an alkoxy group having from 1 to 6 carbon atoms and at least one ether or ester functional group, or a group with the Formula: each occurrence of the subscripts a, m, n, p, x and y is independently an integer wherein a is 1 to 3; m is 0 to 500, n is 1 to 500, p is 0 to 10, x is 0 to 50, and y is 0 to 50 with the provisos that (i) the molar ratio of m to n is from 0 to 15, and (ii) the molar ratio of p to n is from 0 to 1; and each occurrence of R 1 is independently an alkyl group having from 1 to 6 carbon atoms, a phenyl group or an arenyl group having 7 to 12 carbon atoms; each occurrence of R 2 is independently an alkyl group having from 1 to 6 carbon atoms; each occurrence of R 3 is independently a phenyl group or an arenyl group having 7 to 12 carbon atoms; each X 1 is independently a hydroxyl group, an alkoxy group having from 1 to 6 carbon atoms, or an alkoxy group having from 1 to 6 carbon atoms and at least one ether or ester functional group; each X 2 is independently a hydroxyl group, an alkoxy group having from 1 to 6 carbon atoms, an alkoxy group having from 1 to 6 carbon atoms and at least one ether or ester functional group, or a group with the Formula: each occurrence of the subscripts a, m, n, p, x and y is independently an integer wherein a is 1 to 3; m is 0 to 500, n is 1 to 500, p is 0 to 10, x is 0 to 50, and y is 0 to 50 with the provisos that (i) the molar ratio of m to n is from 0 to 15, and (ii) the molar ratio of p to n is from 0 to 1; and (i) the molar ratio of m to n is from 0 to 15, and (ii) the molar ratio of p to n is from 0 to 1; and (d) at least one curing catalyst.