#207-SB Special Clear Hardener


In stock online.
Model # 372920 | Mfg # 207-SB | UPC # 811343010669

When working with WEST SYSTEM 105 Epoxy Resin, this is the hardener to use where a clear finish is desired.

207 Special Clear Hardener is formulated for coating and fiberglass cloth application where a clear, moisture-resistant, result is preferred. For fiberglass layups over wood, 207 Special Clear Hardener allows the natural grain of the wood to show through. Other uses include carbon fiber layups where a clear effect is desired. This hardener cures to a light amber color, similar to traditional spar varnish.

Other properties

207 Special Clear Hardener is formulated to self level for smooth finishes, and for wetting out and bonding fabrics. Although it provides good physical properties for general bonding applications, it is more difficult to thicken and less cost effective for this purpose than 205 or 206 Hardeners. Although it contains a UV stabilization additive, it still requires long-term UV protection with a quality marine paint or varnish.

Meter the mix

207 Special Clear Hardener requires mixing with 105 Epoxy Resin at a 3:1 ratio. To make this easy, for Group Sizes A, B and C, we strongly recommend purchase of the 300 Mini-Pump Kit (Model 3405669) which enables mixing the desired quantity in the exact proportions that you need. Large quantities can be metered with the model 306-23 Special Purpose Resin/Hardener pump (Model 128845), which also dispenses hardener and 105 Epoxy Resin at a ratio of 3:1.

Key Features

  • Excellent for use in hot or humid conditions
  • Produces a clear, low-blush finish
  • Provides excellent adhesion for bonding applications
  • Contains UV stabilization additive, but still  requires long term UV protection with quality marine paint or varnish
  • 300 Mini-Pump Kit recommended for Group Sizes A, B, and C
  • 306-23 Special Purpose Resin/Hardener Pump (Model 128845) recommended for large quantities

Pair the Group Size of the hardener you choose with the correct Group Size of 105 Epoxy Resin.

207 SB-Size hardener should be paired with 105 B-Size Resin.

Selection Guide

 WARNING: This product can expose you to chemicals, including propylene oxide, which is known to the State of California to cause cancer. For more information, go to


#207-SB Special Clear Hardener

Name Value
Best Use Special Clear Non-Blushing Hardener for 105 Epoxy Resin
Capacity 0.33 Gallons
Cure Time 10 to 15 Hours (Working Time 100-120 Minutes) at 72 F
Type Hardener


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