Often used in lower temperatures, West System's 205 Fast Hardener a medium-viscosity epoxy curing agent that is often used to produce a rapid cure that develops its physical properties quickly at room temperature. 

When used with West System's 105 Resin in a five part resin to one part hardener ratio, the cured resin/hardener mixture yields a high-strength, rigid solid which has excellent cohesive properties and provides an outstanding moisture vapour barrier, with excellent bonding & coating properties.

Specifications:

Pot Life (at 25C): 10-15 minutes.
Cures to a solid state in 5-7 hours at 21C.
Cures to a maximum strength in 5-7 days at 21C.
Minimum Recommended Temperature: 5C.