I'm looking at an industrial formulator's catalog (magnolia plastics, www.magnaepoxy.com). Their Modified Aliphatic Amine is a general room temp fast cure hardner. Their comments: "accelerated reactivity", "fast cure in thin sections", "fast cure low viscosity". They offer the folllowing general note:"Unsealed containers of each component will allow the component to absorb moister form the air - especially the hardner. Extensive water absorption by the components will alter the chemistry of the reaction and change the properties of the cured materials". Hope this helps!