Curable compositions comprising hydroxyl compounds which bear silyl groups and are of the formula 1 where a is an integer from 1 to 3, b is an integer from 0 to 2, and the sum of a and b is equal to 3, c is an integer from 0 to 22, d is an integer from 1 to 1000, e is an integer from 0 to 10 000, f is an integer from 0 to 1000, g is an integer from 0 to 1000, h, i and j are each integers from 0 to 500, n is an integer from 2 to 8, and with the proviso that the fragments with the indices d to j are freely permutable with one another, i.e. are exchangeable for one another in the sequence within the polyether chain, and R represents one or more identical or different radicals selected from linear or branched, saturated or mono- or polyunsaturated alkyl radicals having 1 to 20 carbon atoms or haloalkyl groups having 1 to 20 carbon atoms, and R 1 is a saturated or unsaturated, optionally branched radical attached via an oxygen atom, or a polyether radical of the alkoxy, arylalkoxy or alkylarylalkoxy group type in which the carbon chain may be interrupted by oxygen atoms, or a polyetheralkoxy radical or an optionally singly or multiply fused aromatic aryloxy group, R 2 and R 3, and R 5 and R 6, are the same, or else are each independently, H or a saturated or mono- or polyunsaturated, also further-substituted, optionally mono- or polyvalent hydrocarbon radical, it being the case the R 5 and R 6 radicals are each a monovalent hydrocarbon radical and the hydrocarbon radical might be cycloaliphatically bridged via the Y fragment; Y may be absent, or else may be a methylene bridge having 1 or 2 methylene units; if Y is absent, R 2 and R 3 are each independently a linear or branched radical having 1 to 20 carbon atoms, R 4 is a linear or branched alkyl radical of 1 to 24 carbon atoms or an aromatic or cycloaliphatic radical which may optionally in turn bear alkyl groups, R 7 and R 8 are each independently hydrogen, alkyl, alkoxy, aryl or aralkyl groups which are copolymerized with ring-opening polymerization to give crosslinkable polyether esters containing alkoxysilane groups, R 9, R 10, R 11 and R 12 are each independently hydrogen, alkyl, alkenyl, alkoxy, aryl or aralkyl groups, where the hydrocarbon radical may be bridged cycloaliphatically or aromatically via the Z fragment, and Z may be either a divalent alkylene or alkenylene radical, and at least one further silane compound different from formula 1. a is an integer from 1 to 3, b is an integer from 0 to 2, and the sum of a and b is equal to 3, c is an integer from 0 to 22, d is an integer from 1 to 1000, e is an integer from 0 to 10 000, f is an integer from 0 to 1000, g is an integer from 0 to 1000, h, i and j are each integers from 0 to 500, n is an integer from 2 to 8, and with the proviso that the fragments with the indices d to j are freely permutable with one another, i.e. are exchangeable for one another in the sequence within the polyether chain, R represents one or more identical or different radicals selected from linear or branched, saturated or mono- or polyunsaturated alkyl radicals having 1 to 20 carbon atoms or haloalkyl groups having 1 to 20 carbon atoms, and R 1 is a saturated or unsaturated, optionally branched radical attached via an oxygen atom, or a polyether radical of the alkoxy, arylalkoxy or alkylarylalkoxy group type in which the carbon chain may be interrupted by oxygen atoms, or a polyetheralkoxy radical or an optionally singly or multiply fused aromatic aryloxy group, R 2 and R 3, and R 5 and R 6, are the same, or else are each independently, H or a saturated or mono- or polyunsaturated, also further-substituted, optionally mono- or polyvalent hydrocarbon radical, it being the case the R 5 and R 6 radicals are each a monovalent hydrocarbon radical and the hydrocarbon radical might be cycloaliphatically bridged via the Y fragment; Y may be absent, or else may be a methylene bridge having 1 or 2 methylene units; if Y is absent, R 2 and R 3 are each independently a linear or branched radical having 1 to 20 carbon atoms, R 4 is a linear or branched alkyl radical of 1 to 24 carbon atoms or an aromatic or cycloaliphatic radical which may optionally in turn bear alkyl groups, R 7 and R 8 are each independently hydrogen, alkyl, alkoxy, aryl or aralkyl groups which are copolymerized with ring-opening polymerization to give crosslinkable polyether esters containing alkoxysilane groups, R 9, R 10, R 11 and R 12 are each independently hydrogen, alkyl, alkenyl, alkoxy, aryl or aralkyl groups, where the hydrocarbon radical may be bridged cycloaliphatically or aromatically via the Z fragment, and Z may be either a divalent alkylene or alkenylene radical, and at least one further silane compound different from formula 1.