West System Brand Qualifies for Free Shipping West System Extra Slow Hardener .33 Gallon #209-SB

WEST SYSTEM Extra Slow Hardener .33 Gallon #209-SB

$133.11 $165.24 -20% OFF

WEST SYSTEM Extra Slow Hardener .33 Gallon #209-SB

$133.11 $165.24 -20% OFF

WEST SYSTEM Extra Slow Hardener .33 Gallon #209-SB

$133.11 $165.24 -20% OFF

SKU: WSB-209-SB

UPC: 811343010713

More about this item

WEST SYSTEM 209-SB Fiberglass & Repair

209 Extra Slow Hardener is specifically formulated for use with WEST SYSTEM 105 Resin in extremely warm and/or humid conditions, or when extended working time is essential at room temperature. This .33 gallon container is ideal for users who need maximum working time for complex laminating, large-area coating, or detailed assembly work.

Maximum Working Time:

209 Extra Slow Hardener provides approximately twice the working time of 206 Slow Hardener, giving you 40-50 minutes of pot life at 72°F. This extended open time is invaluable for large laminating projects, complex assemblies, or situations where you need ample time to wet out fabrics, position components, or apply coatings without rushing.

Engineered for Hot, Humid Conditions:

When working in extremely warm or humid environments where standard hardeners cure too quickly, 209 Extra Slow Hardener maintains workable consistency and provides adequate working time. Even at 95°F, it still offers 15-20 minutes of pot life, making it the preferred choice for summer work or tropical climates.

High-Quality Physical Properties:

When mixed with 105 Epoxy Resin at the proper 3:1 ratio (three parts resin to one part hardener), the cured mixture forms a clear, amber-colored solid with good physical properties and excellent moisture resistance for demanding bonding and coating applications.

Working Characteristics:

  • Mix Ratio: 3 parts 105 Resin to 1 part 209 Hardener (by volume)
  • Pot Life at 72°F: 40-50 minutes for extended working time
  • Pot Life at 95°F: 15-20 minutes in hot conditions
  • Cure to Solid State at 72°F: 20-24 hours
  • Cure to Solid State at 95°F: 6-8 hours
  • Cure to Maximum Strength at 72°F: 4-9 days
  • Minimum Temperature: 70°F for reliable cure

Key Benefits:

  • Extended Working Time: Twice the pot life of 206 Slow Hardener
  • Hot Weather Performance: Maintains workability in extreme heat
  • Humidity Resistant: Performs reliably in humid conditions
  • Good Physical Properties: Strong, moisture-resistant bonds and coatings
  • Clear Amber Finish: Forms transparent, amber-colored solid
  • Versatile: Suitable for general coating and bonding applications

Ideal Applications:

  • Large-area laminating requiring extended wet-out time
  • Complex assemblies needing careful positioning
  • Working in extremely warm or humid conditions
  • Summer construction in hot climates
  • Coating applications requiring smooth, even coverage
  • Any project where maximum working time is beneficial

Important Notes:

209 Extra Slow Hardener is not intended for clear coating applications. For bright-finished or clear-coated work, use 207 Special Clear Hardener instead. Note the 3:1 mix ratio—this hardener requires a different ratio than 205 or 206 hardeners, so verify you're using the correct metering pumps or measuring method.

This .33 gallon container provides substantial material for users who need the extended working time and hot-weather performance that 209 Extra Slow Hardener delivers.

Part Number: 209-SB
UPC Code: 811343010713

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