West System Fiberglass 205 Fast Hardener The 205 Fast Hardener is a medium viscosity epoxy curing agent for West System 105 Epoxy Resin. Able to rapid cure epoxy even in low temperatures. Mix with West System Resin in a five part resin to one part hardener ratio. The cured epoxy offers a high strength, rigid, and moisture resistant coat. Not intended for clear coating Product Features Pot Life at 72F 22C 9-12 minutes Cure to a solid state 6-8 hours Cure to Maximum Strength 1-4 days Minimum recom