West System West System 207 Special Clear Hardener — Mix Ratio & Calculator
Data sourced from manufacturer SDS & TDS · Last verified September 01, 2026
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Quick Answer
West System West System 207 Special Clear Hardener mix ratio: 5:1 by volume, 5:0.86 by weight
Max pour depth: 0.0625" · Full cure: 24h · Ideal temp: 72°F · Price: $55–$110/gal
⚠️ Exothermic Risk — The weight ratio (5:0.86) is NOT 1:1. Resin and hardener have different densities. Using a 1:1 scale ratio will result in incorrect curing. Always mix by weight using the ratio above.
Special clear hardener for use with West System 105 epoxy resin. Formulated for crystal-clear, blush-free coatings on wood, fiberglass, and metal. UV-resistant finish ideal for brightwork, instrument finishing, and clear coating applications.
| Volume Mix Ratio (A:B) | 5:1 |
| Weight Mix Ratio (A:B) | 5:0.86 — use this for scale mixing |
| Max Pour Depth | 0.0625" / 1.5mm |
| Ideal Temperature | 72°F |
| Full Cure Time | 24 hours |
| Viscosity | 900 cps |
| Coverage | 30 sq ft/gal |
| Average Price | $55–$110/gal (Surface Coating market avg, 2026) |
Safety Note
The weight ratio (5:0.86) is NOT 1:1. Resin and hardener have different densities. Using a 1:1 scale ratio will result in incorrect curing. Always mix by weight using the ratio above.
The weight ratio (5:0.86) is NOT 1:1. Resin and hardener have different densities. Using a 1:1 scale ratio will result in incorrect curing. Always mix by weight using the ratio above.