Compositions comprising: (i) 100 parts by weight of an aminoalkyl-containing polydimethylsiloxane having an amine number of not less than 0.05 mequiv/g of polydimethylsiloxane, constructed of units of general formula I R 1 a R 2 b SiO (4-a-b/2), where R 1 represents unsubstituted or halogen-substituted alkyl moieties of 1-40 carbon atoms, -OR or -OH, R represents unsubstituted or halogen-substituted alkyl moieties of 1-40 carbon atoms, R 2 represents aminoalkyl moieties of general formula II -R 3 -NR 4 R 5, R 3 represents divalent hydrocarbon moieties of 1-40 carbon atoms, R 4 and R 4' each represents monovalent hydrocarbon moieties of 1-40 carbon atoms or H, R 5 represents H or a moiety of general formula III -(R 6 -NR 4) x R 4, R 6 represents a divalent moiety of general formula IV -(CR 4' R 4' -) y, x represents the value 0 or a value from 1 to 40, y represents the value 1 or 2, a represents the value 0, 1, 2 or 3, b represents the value 0, 1, 2 or 3, and a+b represents an average value from 1.5 to 2.5, with the proviso that not more than 20 mol% of the R 1 moieties are OH or OR, (ii) 1 to 80 parts by weight of a silicon compound comprising alkoxy groups bonded to silicon, and (iii) 0.5 to 15 parts by weight of metal C 1 -C 4 -carboxylate, wherein the metal is selected from Zr, Ti and Zn. (i) 100 parts by weight of an aminoalkyl-containing polydimethylsiloxane having an amine number of not less than 0.05 mequiv/g of polydimethylsiloxane, constructed of units of general formula I R 1 a R 2 b SiO (4-a-b/2), where R 1 represents unsubstituted or halogen-substituted alkyl moieties of 1-40 carbon atoms, -OR or -OH, R represents unsubstituted or halogen-substituted alkyl moieties of 1-40 carbon atoms, R 2 represents aminoalkyl moieties of general formula II -R 3 -NR 4 R 5, R 3 represents divalent hydrocarbon moieties of 1-40 carbon atoms, R 4 and R 4' each represents monovalent hydrocarbon moieties of 1-40 carbon atoms or H, R 5 represents H or a moiety of general formula III -(R 6 -NR 4) x R 4, R 6 represents a divalent moiety of general formula IV -(CR 4' R 4' -) y, x represents the value 0 or a value from 1 to 40, y represents the value 1 or 2, a represents the value 0, 1, 2 or 3, b represents the value 0, 1, 2 or 3, and a+b represents an average value from 1.5 to 2.5, with the proviso that not more than 20 mol% of the R 1 moieties are OH or OR, R 1 represents unsubstituted or halogen-substituted alkyl moieties of 1-40 carbon atoms, -OR or -OH, R represents unsubstituted or halogen-substituted alkyl moieties of 1-40 carbon atoms, R 2 represents aminoalkyl moieties of general formula II -R 3 -NR 4 R 5, R 3 represents divalent hydrocarbon moieties of 1-40 carbon atoms, R 4 and R 4' each represents monovalent hydrocarbon moieties of 1-40 carbon atoms or H, R 5 represents H or a moiety of general formula III -(R 6 -NR 4) x R 4, R 6 represents a divalent moiety of general formula IV -(CR 4' R 4' -) y, x represents the value 0 or a value from 1 to 40, y represents the value 1 or 2, a represents the value 0, 1, 2 or 3, b represents the value 0, 1, 2 or 3, and a+b represents an average value from 1.5 to 2.5, (ii) 1 to 80 parts by weight of a silicon compound comprising alkoxy groups bonded to silicon, and (iii) 0.5 to 15 parts by weight of metal C 1 -C 4 -carboxylate, wherein the metal is selected from Zr, Ti and Zn.