- Designed for bonding and coating projects in hot or humid conditions or when extended working time is desired
- Offers the longest working time of any WEST SYSTEM hardener—ideal for large or complex laminations
- Cures to a high-strength, moisture-resistant solid when mixed with 105 Resin
- Provides excellent bonding and barrier coating properties for marine applications
- Not intended for clear coating—use 207 Hardener for bright finishes
- Mix ratio: 3 parts 105 Resin to 1 part 209 Hardener (by volume)
- Pot life of 20 to 25 minutes at 72°F (22°C) & 15 to 20 minutes (at 95°F) for a longer working time
- Hardener Cure Temperature range is 65°F to 105°F
- Cures to a solid state in 20 to 24 hours (at 72°F) & 6 to 8 hours (at 95°F); full working strength in 4 to 9 days
- Minimum recommended application temperature: 70°F (21°C)
WEST SYSTEM 209 Extra Slow Hardener®
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Storage & Shelf Life
Store at room temperature. Keep containers closed to prevent contamination.
With proper storage, resin and hardeners should remain usable for many years. After a long storage period, verify the metering accuracy of the pumps. Mix a small test batch to assure proper curing. Over time, 105 Resin will thicken slightly and will therefore require extra care when mixing. Repeated freeze/thaw cycles during storage may cause crystallization of 105 Resin. Warm resin to 125°F and stir to dissolve crystals.
Hardeners may darken with age, but physical properties are not affected by color. If clear finishing, be aware of a possible color shift if very old and new hardeners are used on the same project.