A coating composition comprising an oxidatively drying binder and an anti-skinning agent, the anti-skinning agent comprising: a) a diketone of formula I wherein n is an integer selected from 1 and 2, preferably wherein n is 1; and R 1 is selected from the group comprising C 1-24 alkyl, C 6-20 aryl, C 6-20 arylC 1-12 alkyl, heteroaryl, heteroarylC 1-12 alkyl, each group being optionally substituted with one or more substituents each independently selected from the group comprising C 1-6 alkyl,-OH, and halogen; R 2 is selected from the group comprising C 1-24 alkyl, C 6-20 aryl, C 6-20 arylC 1-12 alkyl, heteroaryl, heteroarylC 1-12 alkyl, each group being optionally substituted with one or more substituents each independently selected from the group comprising C 1-6 alkyl,-OH, and halogen; or R 1 taken together with R 2 form a 4, 5, 6, 7, 8, 9 or 10-membered carbon ring, optionally substituted with one or more substituents each independently selected from the group comprising C 1-6 alkyl, -OH, and halogen; and b) an aldoxime or ketoxime of formula II wherein R 3 is hydrogen or is selected from the group comprising C 1-24 alkyl, C 6-20 aryl, C 6-20 arylC 1-12 alkyl, heteroaryl, heteroarylC 1-12 alkyl, each group being optionally substituted with one or more substituents each independently selected from the group comprising C 1-6 alkyl, -OH, and halogen; R 4 is hydrogen or is selected from the group comprising C 1-24 alkyl, C 6-20 aryl, C 6-20 arylC 1-12 alkyl, heteroaryl, heteroarylC 1-12 alkyl, each group being optionally substituted with one or more substituents each independently selected from the group comprising C 1-6 alkyl, -OH, and halogen; or R 3 taken together with R 4 form a 5, 6, 7, 8, 9 or 10-membered carbon ring, optionally substituted with one or more substituents each independently selected from the group comprising C 1-6 alkyl, -OH, and halogen. a) a diketone of formula I wherein n is an integer selected from 1 and 2, preferably wherein n is 1; and R 1 is selected from the group comprising C 1-24 alkyl, C 6-20 aryl, C 6-20 arylC 1-12 alkyl, heteroaryl, heteroarylC 1-12 alkyl, each group being optionally substituted with one or more substituents each independently selected from the group comprising C 1-6 alkyl,-OH, and halogen; R 2 is selected from the group comprising C 1-24 alkyl, C 6-20 aryl, C 6-20 arylC 1-12 alkyl, heteroaryl, heteroarylC 1-12 alkyl, each group being optionally substituted with one or more substituents each independently selected from the group comprising C 1-6 alkyl,-OH, and halogen; or R 1 taken together with R 2 form a 4, 5, 6, 7, 8, 9 or 10-membered carbon ring, optionally substituted with one or more substituents each independently selected from the group comprising C 1-6 alkyl, -OH, and halogen; and n is an integer selected from 1 and 2, preferably wherein n is 1; and R 1 is selected from the group comprising C 1-24 alkyl, C 6-20 aryl, C 6-20 arylC 1-12 alkyl, heteroaryl, heteroarylC 1-12 alkyl, each group being optionally substituted with one or more substituents each independently selected from the group comprising C 1-6 alkyl,-OH, and halogen; R 2 is selected from the group comprising C 1-24 alkyl, C 6-20 aryl, C 6-20 arylC 1-12 alkyl, heteroaryl, heteroarylC 1-12 alkyl, each group being optionally substituted with one or more substituents each independently selected from the group comprising C 1-6 alkyl,-OH, and halogen; or R 1 taken together with R 2 form a 4, 5, 6, 7, 8, 9 or 10-membered carbon ring, optionally substituted with one or more substituents each independently selected from the group comprising C 1-6 alkyl, -OH, and halogen; and b) an aldoxime or ketoxime of formula II wherein R 3 is hydrogen or is selected from the group comprising C 1-24 alkyl, C 6-20 aryl, C 6-20 arylC 1-12 alkyl, heteroaryl, heteroarylC 1-12 alkyl, each group being optionally substituted with one or more substituents each independently selected from the group comprising C 1-6 alkyl, -OH, and halogen; R 4 is hydrogen or is selected from the group comprising C 1-24 alkyl, C 6-20 aryl, C 6-20 arylC 1-12 alkyl, heteroaryl, heteroarylC 1-12 alkyl, each group being optionally substituted with one or more substituents each independently selected from the group comprising C 1-6 alkyl, -OH, and halogen; or R 3 taken together with R 4 form a 5, 6, 7, 8, 9 or 10-membered carbon ring, optionally substituted with one or more substituents each independently selected from the group comprising C 1-6 alkyl, -OH, and halogen. R 3 is hydrogen or is selected from the group comprising C 1-24 alkyl, C 6-20 aryl, C 6-20 arylC 1-12 alkyl, heteroaryl, heteroarylC 1-12 alkyl, each group being optionally substituted with one or more substituents each independently selected from the group comprising C 1-6 alkyl, -OH, and halogen; R 4 is hydrogen or is selected from the group comprising C 1-24 alkyl, C 6-20 aryl, C 6-20 arylC 1-12 alkyl, heteroaryl, heteroarylC 1-12 alkyl, each group being optionally substituted with one or more substituents each independently selected from the group comprising C 1-6 alkyl, -OH, and halogen; or R 3 taken together with R 4 form a 5, 6, 7, 8, 9 or 10-membered carbon ring, optionally substituted with one or more substituents each independently selected from the group comprising C 1-6 alkyl, -OH, and halogen.