Compositions crosslinkable by condensation reaction, producible using (A) organosilicon compounds having at least two silanol groups and having a viscosity, determined in accordance with the method specified in the description, of 10 3 to 10 6 mPas at 25°C, and (M) mixtures containing (B) organosilicon compounds of the formula R 6 R 7 N-CR 1 2 SiR a (OR 2 ) 3-a (I), in which R denotes identical or different monovalent hydrocarbon radicals, R 1 denotes identical or different monovalent hydrocarbon radicals or a hydrogen atom, R 2 may be identical or different and denotes monovalent, optionally substituted hydrocarbon radicals, R 6 may be identical or different and denotes monovalent, optionally substituted hydrocarbon radicals or a hydrogen atom, R 7 may be identical or different and denotes monovalent, optionally substituted hydrocarbon radicals, where R 6 and R 7 can also form a ring which may optionally be interrupted by heteroatoms, and a is equal to 0 or 1, and/or the partial hydrolysates thereof, component (C), selected from (C2) compounds of the formula R 5 OH (III), in which R 5 may be identical or different and denotes monovalent, optionally substituted hydrocarbon radicals, and optionally (D) catalyst. (A) organosilicon compounds having at least two silanol groups and having a viscosity, determined in accordance with the method specified in the description, of 10 3 to 10 6 mPas at 25°C, and (M) mixtures containing (B) organosilicon compounds of the formula R 6 R 7 N-CR 1 2 SiR a (OR 2 ) 3-a (I), in which R denotes identical or different monovalent hydrocarbon radicals, R 1 denotes identical or different monovalent hydrocarbon radicals or a hydrogen atom, R 2 may be identical or different and denotes monovalent, optionally substituted hydrocarbon radicals, R 6 may be identical or different and denotes monovalent, optionally substituted hydrocarbon radicals or a hydrogen atom, R 7 may be identical or different and denotes monovalent, optionally substituted hydrocarbon radicals, where R 6 and R 7 can also form a ring which may optionally be interrupted by heteroatoms, and a is equal to 0 or 1, and/or the partial hydrolysates thereof, component (C), selected from (C2) compounds of the formula R 5 OH (III), in which R 5 may be identical or different and denotes monovalent, optionally substituted hydrocarbon radicals, and optionally (D) catalyst. R denotes identical or different monovalent hydrocarbon radicals, R 1 denotes identical or different monovalent hydrocarbon radicals or a hydrogen atom, R 2 may be identical or different and denotes monovalent, optionally substituted hydrocarbon radicals, R 6 may be identical or different and denotes monovalent, optionally substituted hydrocarbon radicals or a hydrogen atom, R 7 may be identical or different and denotes monovalent, optionally substituted hydrocarbon radicals, where R 6 and R 7 can also form a ring which may optionally be interrupted by heteroatoms, and a is equal to 0 or 1, and/or the partial hydrolysates thereof, component (C), selected from (C2) compounds of the formula R 5 OH (III), in which R 5 may be identical or different and denotes monovalent, optionally substituted hydrocarbon radicals, and optionally (D) catalyst. <EOS>