West System® 209 Extra Slow Hardener®. Developed for general coating and bonding applications in extremely warm and/or humid conditions, or when extended working time is desired at room temperature. Formulated for use with West System® 105 Epoxy Resin®. Provides approximately twice the working time of West System 206 Slow Hardener®. Forms a high-strength, moisture-resistant solid with excellent bonding and barrier coating properties. Not intended for clear coating. Mix ratio is 3 parts resin to 1 part hardener by volume. 0.33 gallon.

Cure Times at 72 degrees F (22 degrees C):

- Pot life (100 grams cupful): 40 to 50 minutes
- Working time (thin film): 3 to 4 hours
- Solid state: 20 to 24 hours