West System 655-C205B Fast Hardener, 814 ml (27.5 oz.)
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West System 655-C205B Fast Hardener, 814 ml (27.5 oz.)
The 655-C205B is the larger-format version of the West System fast-cure epoxy hardener, designed for use with West System 105 Resin at a 5:1 mix ratio. It delivers the same rapid, rigid, moisture-resistant cure as the 208 ml size — with a pot life of 9–12 minutes at 22°C (72°F) — but in an 814 ml bottle suited to higher-volume repair work, production laminating, and shops that go through hardener regularly. The larger format reduces per-unit cost and the number of containers to manage on a busy workbench.
Key Features
- Fast cure formulation — pot life of 9–12 minutes at 22°C (72°F)
- Mix ratio: 5 parts 105 Resin to 1 part C205 Hardener by volume
- Produces a rigid, high-strength, moisture-resistant cured solid
- Well-suited to cool working conditions where slower hardeners may under-cure
- 814 ml (27.5 oz.) bottle — economical format for regular or high-volume use
- Compatible with the West System 300 Mini Pump for accurate metered dispensing
Parts Desk Insights
Best Use Case: The C205B is the right choice for customers who already know they want the fast hardener and are doing enough work to justify the larger bottle — production shops, active boatyards, and technicians running multiple repair jobs. The fast cure makes it ideal for cool shop conditions (typically below 21°C / 70°F) where a slow hardener would extend cure time impractically. For customers who only need a small quantity or are trying the system for the first time, point them to the West System 655-C205A Fast Hardener, 208 ml (7 oz.) instead. For jobs requiring longer working time — large pours, complex layups, or warm-weather work — recommend the West System 206 Slow Hardener, the C209SA Extra Slow Hardener, or the C209SB Extra Slow Hardener. For a complete starter setup, the West System 655-C105K Fibreglass Boat Repair Kit includes the fast hardener alongside resin, fillers, and glass tape.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.