West System 205 Fast Hardener

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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 recommended temperature: 40F (4C)
  • Uses General bonding, apply fabric, barrier coating
  • Temperature Range 45 - 85 Degrees
  • Working Time 60-70 Min

Sizes Available:

  • 205-A Fast Hardener Pint
  • 205-B Fast Hardener Quart

Pair West System 105 Epoxy with corresponding letter size on hardener.

Example: 105-A Epoxy Resin Quart requires 205-A Fast Hardener Pint

Mix 5 parts resin with 1 part hardener

*Epoxy cures faster in warmer temperatures and in thicker applications. Epoxy cures slower in cooler temperatures and in thinner applications. All times are estimates. 

Each WEST SYSTEM Epoxy hardener has an ideal temperature cure range. At any given temperature, each epoxy resin/hardener combination will go through the same cure stages but at different rates of speed. Base your hardener selection on the amount of working time you’ll need for the job you’ll be doing at the temperature conditions you’ll be working under. The hardener selection guide and epoxy hardener container labels describe hardener pot lives and cure times.

The data we provide pot life is based on 100 grams or 4 pump strokes each of resin and hardener using our 300 mini pumps. If you are using a larger amount of epoxy or a different size of mixing pot the length of pot life can vary. To increase the pot life of a cup of mixed epoxy, spread it over a larger surface area, work in a cooler environment, or mix multiple, smaller batches as you go.

Click here to download 205 Fast Hardener Safety Data Sheet


California Residents: WARNING Cancer and Reproductive Harm - P65Warnings.ca.gov




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