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205 Fast Hardener is a medium-viscosity epoxy curing agent. It is used in a majority of bonding situations, at lower temperatures, and to produce a rapid cure that develops its physical properties quickly at room temperature. When mixed with WEST SYSTEM 105 Resin in a five-part resin to one-part hardener ratio, the cured resin/hardener mixture yields a rigid, high-strength, moisture-resistant solid with excellent bonding and coating properties. 205 Fast Hardener is not intended for clear coating.
West System Epoxy cures by exothermic (heat) reaction. Be sure to mix in larger containers with more surface area and mix in smaller batches. Mixing in large batches or containers that are too small can cause a dangerous heat reaction and will cause the epoxy to cure too quickly.
Working with 205 Fast Hardener in Cold Weather
In cold weather, use 205 Fast Hardener to cure well at temperatures as low as 40°F. There are several things you can do to ensure a full cure when using epoxy in low temperatures:
The 205 Hardener will amber over time; if you're looking for a water-clear epoxy, choose the West System 207 Special Clear Hardener.
Group Size A Hardener - use with 105-A Resin
Group Size B Hardener - use with 105-B Resin
Helpful tip: Use 300 Mini Pumps to always dispense correct ratio of resin and hardener. One full pump-stroke of resin for every one full pump stroke of hardener is all you need to remember.
Pot Life at 72F (22C): 9 to 12 minutes*
Cure to a solid state: 6 to 8 hours
Cure to maximum strength: 1 to 4 days
Minimum recommended temperature: 40°F (4°C)
*The pot life refers to a confined mass of 100 grams of epoxy
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