Fiberglass Supply Fiberglass Supply Epoxy 635 — Mix Ratio & Calculator
Data sourced from manufacturer SDS & TDS · Last verified September 01, 2026
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Quick Answer
Fiberglass Supply Fiberglass Supply Epoxy 635 mix ratio: 3:1 by volume, 3:0.95 by weight
Max pour depth: 0.5" · Full cure: 18h · Ideal temp: 72°F · Price: $70–$140/gal
⚠️ Exothermic Risk — The weight ratio (3:0.95) 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.
Professional laminating epoxy system for composite construction and marine repairs. Medium viscosity for balanced wet-out and vertical drip resistance. Compatible with fiberglass, carbon fiber, and Kevlar reinforcements.
| Volume Mix Ratio (A:B) | 3:1 |
| Weight Mix Ratio (A:B) | 3:0.95 — use this for scale mixing |
| Max Pour Depth | 0.5" / 12mm |
| Ideal Temperature | 72°F |
| Full Cure Time | 18 hours |
| Viscosity | 550 cps |
| Coverage | 15 sq ft/gal |
| Average Price | $70–$140/gal (Marine & Structural market avg, 2026) |
Safety Note
The weight ratio (3:0.95) 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 (3:0.95) 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.