NOVELTY - Composition comprises an epoxy resin system comprising a reaction product of an epoxy resin component and a curing agent component having a substituted amino compound (I) and a second amine compound having at least one primary amine group and/or at least one secondary amine group, where the stoichiometric ratio of the nitrogen-hydrogen bonds of the second amine compound to the epoxy groups of the epoxy resin component is 1:20-21:20 and the molar ratio of the second amine compound to (I) is 0.01:1-100:1.    USE - The composition is useful: for preparing a composite as a windmill blade (all claimed); for manufacturing coating compositions e.g. ambient temperature cure coating compositions and heat cured coating compositions; and in one-part or two-part coating formulations.    ADVANTAGE - The composition provides: epoxy resin systems which exhibit reduced exothermic heat generation, reduced processing temperature, lowered cure exothermic temperatures and heat generation with improved control on cure shrinkage, and a more rapid cure rate under typical mold conditions (enabling reduced cycle times) combined with desired cured mechanical properties when compared to conventional resin compositions; and composite materials with improved transverse tensile strength and transverse tensile strain properties with improved 0 degrees flex strength and in-plane shear strength.    DETAILED DESCRIPTION - Composition comprises an epoxy resin system comprising a reaction product of an epoxy resin component and a curing agent component having a substituted amino compound of formula ((R1)N(R2)(R3)) (I) and a second amine compound having at least one primary amine group and/or at least one secondary amine group, where the stoichiometric ratio of the nitrogen-hydrogen bonds (-N-H) of the second amine compound to the epoxy groups of the epoxy resin component is 1:20-21:20 and the molar ratio of the second amine compound to (I) is 0.01:1-100:1.    R1, R2 = organic functional group having 1-6C; and    R3 = 2-18C alkyl.    An INDEPENDENT CLAIM is also included for a composite prepared using the epoxy resin composition.