A curable composition comprising: a) a first part comprising a reaction product of a first reaction mixture comprising 1) 55 to 80 weight percent of a polyamine based on a total weight of the first part, the polyamine having at least two -NHR 1 groups wherein each R 1 is independently hydrogen, alkyl, aryl, aralkyl, or alkaryl; 2) 5 to 25 weight percent of a first epoxy resin based on the total weight of the first part, the first epoxy resin being reactive with the polyamine; 3) 2 to 12 weight percent of a first core-shell rubber particle based on the total weight of the first part, the first core-shell rubber particle being dispersed in the first part and having a surface modified epoxy-containing group that is reactive with the polyamine; and 4) 1 to 12 weight percent of a second core-shell rubber particle based on the total weight of the first part, the second-core shell rubber particle being dispersed in the first part and free of the surface-modifying epoxy-containing group; and 5) 0 to 10 weight percent of a curing agent based on the total weight of the first part; and 6) 0 to 15 weight percent of an inorganic filler based on the total weight of the first part; and b) a second part comprising 1) a second epoxy resin; and 2) a third core-shell rubber particle and/or a fourth core-shell rubber particle, the third core-shell rubber particle and/or the fourth core-shell rubber particle being dispersed in the second part, wherein the third core-shell rubber particle has a surface modified epoxy-containing group and the fourth core-shell rubber particle is free of the surface modified group. a) a first part comprising a reaction product of a first reaction mixture comprising 1) 55 to 80 weight percent of a polyamine based on a total weight of the first part, the polyamine having at least two -NHR 1 groups wherein each R 1 is independently hydrogen, alkyl, aryl, aralkyl, or alkaryl; 2) 5 to 25 weight percent of a first epoxy resin based on the total weight of the first part, the first epoxy resin being reactive with the polyamine; 3) 2 to 12 weight percent of a first core-shell rubber particle based on the total weight of the first part, the first core-shell rubber particle being dispersed in the first part and having a surface modified epoxy-containing group that is reactive with the polyamine; and 4) 1 to 12 weight percent of a second core-shell rubber particle based on the total weight of the first part, the second-core shell rubber particle being dispersed in the first part and free of the surface-modifying epoxy-containing group; and 5) 0 to 10 weight percent of a curing agent based on the total weight of the first part; and 6) 0 to 15 weight percent of an inorganic filler based on the total weight of the first part; and 1) 55 to 80 weight percent of a polyamine based on a total weight of the first part, the polyamine having at least two -NHR 1 groups wherein each R 1 is independently hydrogen, alkyl, aryl, aralkyl, or alkaryl; 2) 5 to 25 weight percent of a first epoxy resin based on the total weight of the first part, the first epoxy resin being reactive with the polyamine; 3) 2 to 12 weight percent of a first core-shell rubber particle based on the total weight of the first part, the first core-shell rubber particle being dispersed in the first part and having a surface modified epoxy-containing group that is reactive with the polyamine; and 4) 1 to 12 weight percent of a second core-shell rubber particle based on the total weight of the first part, the second-core shell rubber particle being dispersed in the first part and free of the surface-modifying epoxy-containing group; and 5) 0 to 10 weight percent of a curing agent based on the total weight of the first part; and 6) 0 to 15 weight percent of an inorganic filler based on the total weight of the first part; and b) a second part comprising 1) a second epoxy resin; and 2) a third core-shell rubber particle and/or a fourth core-shell rubber particle, the third core-shell rubber particle and/or the fourth core-shell rubber particle being dispersed in the second part, wherein the third core-shell rubber particle has a surface modified epoxy-containing group and the fourth core-shell rubber particle is free of the surface modified group. 1) a second epoxy resin; and 2) a third core-shell rubber particle and/or a fourth core-shell rubber particle, the third core-shell rubber particle and/or the fourth core-shell rubber particle being dispersed in the second part, wherein the third core-shell rubber particle has a surface modified epoxy-containing group and the fourth core-shell rubber particle is free of the surface modified group.