205 fast hardener is a medium-viscosity epoxy curing agent. It is useful in a majority of bonding situations, and at lower temperatures. 205 fast hardener produces a rapid epoxy cure that develops physical properties quickly at room temperature. Mix it with West System 105 resin in a five-part resin to one-part hardener ratio. The resulting cured epoxy is a rigid, high-strength, moisture-resistant solid. The combination of 105 resin/205 fast hardener has excellent bonding and coating properties.