Special Clear Hardener (West System)

207 Special Hardener, .66 Pint - West System
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Part # 207SA ValueShip™ Eligible
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West System

207 Special Clear Hardener™ was developed for coating and fiberglass cloth application where an exceptionally clear, moisture-resistant, natural wood finish is desired. 207 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 207 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 sandd the following day. Boats can be built faster. Builders also appreciate the excellent fiberglass wet-out characteristics achieved with 105/207, yet it won't drain from vertical surfaces like the very slow curing, low-viscosity epoxies.

105/207 has strong physical properties, so it can be used as a structural adhesive for gluing and l aminating. It has excellent compatibility with paints and varnishes. An ultraviolet inhibitor in 207 helps provide a beautiful, long lasting finish when used with quality UV filtering varnish. 105/207 cures clear and colorless.

Mix Ratio, Resin:Hardener 3 parts resin : 1 part hardener
Pot life at 72°F (22°C) 20 to 26 minutes
Cure to a solid state 10 to 15 hours
Cure to maximum strength 4 to 7 days
Minimum recommended temperature 60°F (16°C)
Pumps 300, 306-23 or 309-3

Store at room temperature. Keep containers closed to prevent contamination. With proper storage, resin and hardeners should remain usable for many years. 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. After a long storage, verify the metering accuracy of the pumps and mix a small test batch to assure proper curing.

Hardener Uses
Hardener Temperature Range (F) Cure Speeds at 72 degrees
Pot Life: 100g cupful Working Time: thin film Cure to Solid: thin film
205 Fast Hardener General bonding, fabric application and barrier coating 45-85 degrees 9-12 min 60-70 min 6-8 hours
206 Slow Hardener General bonding, fabric application and barrier coating 60-90 degrees 20-25 min 90-110 min 10-15 hours
207 Special Clear Hardener Clear fabric application and clear coating for a natural wood finish 60-90 degrees 22-27 min 110-130 min 12-18 hours
209 Extra Slow Hardener General bonding, fabric application and barrier coating 65-100 degrees 40-50 min 3-4 hours 20-24 hours

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