205 Fast Hardener is a medium-viscosity epoxy curing agent. It is used in a majority of situations, at lower temperatures and to produce a rapid cure that develops its physical properties quickly at room temperature. Pot life at 72 degrees F (22 degrees C): 9-12 minutes. Cure to a solid state: 6-8 hours. Cure to maximum temperature: 1 to 4 days. Minimum recommended temperature: 40 degrees F (40C).