WEST System
WEST SYSTEM 207 Special Clear Hardener
WEST SYSTEM 207 Special Clear Hardener
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Product Details
West System 207 Special Clear Hardener was developed for use with West System 105 epoxy resin in coating applications where an exceptionally clear, moisture-resistant, natural wood finish is desired.
Improved formula chemistry allows for true clear cure with the same UV protection but without an amber tint. An ultraviolet inhibiting additive improves the resistance of a West System epoxy/hardener mixture to sunlight but the cured epoxy surface will still require the additional protection of a quality UV-filtering varnish. The proper ratio is 3 parts resin to 1 part hardener, with a mixing pot life of 20 to 26 minutes. Epoxy mixture will achieve solid state in 10 to 15 hours after application.
207 is designed to self level for smooth finishes and to wet-out and bond fabrics. It's also used for laminating veneers where bleed-through at the joints may be exposed to sunlight. Although this special clear formula 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.
Tech Specs
| Mix Ratio, Resin:Hardener | 3:1 by volume (3.5:1 by weight) |
|---|---|
| Pot life at 72 F (22 C) | 22 to 27 minutes |
| Cure to a solid state | 9 to 12 hours |
| Cure to maximum strength | 4 to 7 days |
| Minimum recommended temperature | 60 F (16 C) |
| Pumps required | 300, 306-23 or 309-3 |
Info & Guides
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Technical Information
- Excellent long-term clarity due to improved chemistry and stabilization with UV filters
- Superior blush resistance
- Extended recoating time
- Excellent fiberglass wet out characteristics
- Ideal viscosity for buildup coats
- Excellent paint and varnish compatibility
- Excellent physical properties for bonding
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Reviews
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20 Ratings-Only Reviews
Questions
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1 - 10 of 29 Questions
Q: null Does West 207 clear hardener with 105 resin give off an amine blush on the surface? What is the re-coat time window before sanding is required?
8 years ago2 Answers
A: The cure time of 207 is similar to 206 hardener, so per the written info from West, if the cure has not progressed to solid (is still tacky, like tape), it can be recoated while achieving a chemical bond. Once the surface is non-tacky, a secondary bond is achieved, and will be strongest by toothing the surface with sandpaper. I think secondary bond means no crosslinking with the under coat. The literature specifically states that there is NO amine blush with 207, and one notices that the mixing ratio and clean-up is different from the other hardeners, soap and water do not work for 207. I first used West System in 1982, and have to be careful with the vapors, I get sinus infections if I don't wear a mask with an activated charcoal filter, a fan is not enough, but that is after forty years of varying levels of use. I think the 207 may be better from that standpoint, it certainly stinks less.
Anonymous10 months agoHelpful?
Q: null Woodie canoe (natural finish) has white fiberglass weave spots showing. Plan to epoxy over those spots, sand (220 grit) and finish with Pettit Cap't Spar Varnish. Would 207 be better than 205 to showcase underlying cedar?
4 years ago4 Answers
A: I very much like the 207, so yes, in this case I would go that way. Thanks, Chuck Jenkins
4 years agoHelpful?
Q: null What is working time of the 207 clear hardener?
4 years ago6 Answers
A: It depends on humidity and temperature. In North Carolina it is pretty humid, and at around 80 degrees, I still get about an hour working time with it.
4 years agoHelpful?
Q: null I am covering a 13ft rowing pram with 6oz fiberglass, I ordered 10yds of fiberglass, how much epoxy should I order, I use West Sytems, covering white cedar. I will then paint with white epoxy bottom paint. Should I order the 207 clear hardener or stay with 205
4 years ago4 Answers
A: I can't address the quantity you need - I never regret having a little extra of these epoxies around - but if you are going to paint over I would just use the 205.
4 years agoHelpful?
Q: null When using West 105 and 207 to apply a paper-backed mahogany veneer with a vacuum press to a new and clean steel surface, what exact type of epoxy(?) primer should be used on the steel?
5 years ago1 Answer
A: Primer is not required. sand the surface with 80 grit, clean the surface, and apply your epoxy.
5 years agoHelpful?
Q: null I am finishing a cherry slab of wood with a large crack in it-(about 2 inches). What kind of epoxy should I use? Do I need to use a filler? I would like to get a clear finish.
5 years ago1 Answer
A: The 207 and the 105 resin will definitely do it and it will be clear. Just be sure to mix properly and you may need quite a bit to fill a 2 inch gap depending on how long it is.
5 years agoHelpful?
Q: null I am looking to fill a cavity between two live edge boards with a 105 and 207 mix. Based on my calculations I'll need enough epoxy to fill about 450 cubic inches to fill the cavity and any knots in the wood. How much resin do I need to buy to make sure I fill the entire cavity?
6 years ago1 Answer
A: You will need 2 gallons to fill 450 cu. in.
6 years agoHelpful?
Q: null I am wanting to coat the bottom of my wooden driftboat. My question is will this product flex as 1) temp changes, 2) going through white water, & 3) when hitting the unavoidable rocks in river.
6 years ago4 Answers
A: Hi JohnI have used this product with West System 105 on my canoe. I applied it 2 times on top of the fiberglass I used it is a very nice finish and looks very durable, and for me the importance was to be able to see the wood grain. I haven't finished the canoe yet and have not been able to test it out under mentioned condition in question.Ample information can be found online.
6 years agoHelpful?
Q: null What is the ratio of 207 hardner to 105 resin . I am filling voids in walnut slabs.
6 years ago4 Answers
A: Hi Stan, the ratio is 3 parts resin to 1 part hardener by volume. Do not add extra hardener, it will only have negative consequences.
6 years agoHelpful?
Q: null Hi there, can anyone tell me if 207 would be a better hardner than 205 for inlaying turquoise into a maple table top? Or what the difference between the two might be? Thank you!
7 years ago1 Answer
A: The 207 is clear, the 205 can be slightly amber in color.
7 years agoHelpful?
1 - 10 of 29 Questions