To obtain a curable compsn. improved in the resistances to water and corrosion, adhesive properties, and solubility in mineral spirit by compounding a specific alkylbisphenol epoxy resin with a curative.

1mol of phenolic hydroxyl group of an alkylbisphenol is reacted with 1.5-15mol of an epihalohydrin in the presence of 0.8-1.3mol of an alkali metal hydroxide under a pressure of 50-760mmHg at 40-120°C for 0.5-15hr to give an alkylbisphenol epoxy resin represented by the formula [wherein n≥1; m ≥0; R1 is 1-9C alkyl; 1≤(a+a')≤4; R2 is 1-9C alkyl; 1≤(b+b')≤4; and X is CH2, C(CH3)2, or SO2] and having an epoxy equivalent of 180-2,000g/eq. An epoxy resin component contg. 50wt.% or higher above-obtd. resin is compounded with an amine curative to give a curable compsn.