Use of a formulation comprising a silane-functionalized prepolymer (I) for screed repair, is claimed. Use of a formulation comprising a silane-functionalized prepolymer of formula (G-(X-(CH 2) m-Si(R1) n(OR2) 3 - n) p) (I) for screed repair, is claimed. G : polymer having a molecular weight of 1000-50000, preferably 1000-5000; R1 : 1-5C alkyl or 6-10C aryl, preferably CH 3, ethyl or phenyl; R2 : 1-4C alkyl, preferably CH 3 or ethyl; either X : -O-, -(CH 2) m-O-, -O-CO-NR-, -O-CO-NR-Y1-T-Y1-NR-CO-NR- or -O-CO-NR-T-C(R) 2-T-NR-CO-NR-; or X+2 adjacent C of backbone of G : 5-6-membered ring; R : H, 1-5C alkyl, phenyl or Michael acceptor group; Y1 : 1-8C alkylene (preferably methylene) or single bond between N and T; T : phenylene, naphthylene, cyclohexylene or 4-10C n-alkylene (all optionally mono-, di- or trisubstituted by 1-3C alkyl, preferably CH 3); m : 1-8, preferably 1-3; n : 0-2, preferably 0; and p : 1-100, preferably 5-10 (when X = -(CH 2) m-O- or X with two adjacent C of backbone of G forms 5-6-membered ring) or 1-50, preferably 2-3.
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