Blush-free 207 Special Clear Hardener was developed for coating and fibreglass cloth application where an exceptionally clear, moisture-resistant, natural wood finish is desired. Blended with 105 Epoxy Resin, 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 Special Clear Hardener because it is reliable, easy to use, as does not blush. Three coats or more can be applied in one day without additional surface preparation. Fewer coats are required to fill fibreglass weave and in most cases, the final coating can be sanded the following day. Boats can be built faster. Builders also appreciate the excellent fibreglass wet-out characteristics achieved with 105 Resin/207 Special Clear Hardener, yet it won’t drain from vertical surfaces like the very slow curing, low-viscosity epoxies.
105/207 Epoxy 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 207 Special Clear Hardener helps provide a beautiful, long-lasting finish when used with quality UV filtering varnish. 105/207 cures clear and colourless.
Mix Ratio: 3 parts resin : 1 part hardener
Pot life at 25°C: 20 to 30 minutes
Cure to a solid state: 9 to 12 hours
Cure to maximum strength: 5 to 7 days
Minimum recommended temperature: 16°C
What is the Resin to Hardener ratio?
The WEST SYSTEM 207 hardener must be mixed in the correct ratio of 3 parts by weight of 105 Resin to 1 part by weight of 207 Hardener.
How is the USA version of WEST SYSTEM 207 hardener clear and the UK version has an amber tinge to it?
The American version of the WEST SYSTEM 207 Hardener is indeed completely clear. However, they are allowed to use chemicals over there which we are prohibited from using here in Europe. In order to give the WEST SYSTEM 207 Hardener it’s degree of UV resistance, it does have a yellow tinge to it. It is clear in the sense that it is transparent, but not clear as in optically clear.
