The invention concerns a liquid, radiation-cured coating composition for glass surfaces, containing (A) 56-89 % by wt. of at least one diethylene-unsaturated polyurethane which may contain carbamide groups; (B) 10-30 % by wt. of at least one ethylene-unsaturated monomer; (C) 0.5-8 % by wt. of at least one photoinitiator; (D) 0.05-6 % by wt. of N-$g(b)-aminoethyl-$g(g)-aminopropyltrimethoxysilane, $g(g)-aminopropyltrimethoxysilane, N-methyl-$g(g)-aminopropyltrimethoxysilane or triamino-modified propyltrimethoxysilane, whereby the sum of components A-D is 100 % by wt. and all the percentages by weight are expressed relative to the coating composition. This coating material is used to coat glass surfaces, in particular glass optical fibres, and is characterized by its good adherence characteristics, even in damp conditions.
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