These Hardeners are part of a TWO PART system that works ONLY in conjunction with West System 105 Resin.
209 Special Clear Hardener® was developed for coating and fiberglass cloth application where a clear, moisture-resistant, natural wood finish is desired. 209 Hardener will not blush or turn cloudy in humid conditions. Thin film applications roll out and tip off smoothly, requiring less sanding in preparation for finish coatings.
Professional and first-time builders like 209 because it is reliable and easy to use. Three coats or more can be applied in one day without additional surface preparation. Fewer coats are required to fill fiberglass weave and in most cases the final coating can be sanded the following day. Boats can be built faster. Builders also appreciate the excellent fiberglass wet-out characteristics achieved with 105/209, yet it won't drain from vertical surfaces like the very slow curing, low-viscosity epoxies.
105/209 has strong physical properties, so it can be used as a structural adhesive for gluing and laminating. It has excellent compatibility with paints and varnishes. An ultraviolet inhibitor in 209 helps provide a beautiful, long lasting finish when used with quality UV filtering varnish.
- Mix Ratio, Resin:Hardener 3 parts resin : 1 part hardener
- Pot life at 72 °F (22 °C) 40 to 50 minutes
- Cure to a solid state 20 to 24 hours
- Cure to maximum strength 4 to 9 days
- Minimum recommended temperature 70 °F (21 °C)
- Pumps 300, 306-23 or 309-3
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