West System C105C Epoxy Resin – 16.46 L (4.35 Gal)

West System C105C Epoxy Resin – 16.46 L (4.35 Gal)

The production-scale format of the C105 epoxy resin system — the same clear, light amber, low-viscosity formula trusted for marine lamination, wood encapsulation, and structural bonding, now in a 16.46 L pail for high-volume builds and boatyard use. C105C delivers consistent performance across large lamination schedules, fairing jobs, and multi-session hull projects where supply continuity and per-litre economy matter.

Must be paired with a compatible West System hardener. Working time and cure speed are determined by hardener selection.

Key Features

• Low viscosity (~1000 cP at 70°F / 21°C) for deep penetration into wood fiber and fiberglass substrates
• Self-leveling under roller application — ideal for large horizontal surfaces and flat panel encapsulation
• Cures across a wide temperature range for reliable performance in varying shop conditions
• Sands, shapes, and paints cleanly after full cure
• Excellent adhesive base when combined with thickening fillers to control sag on vertical surfaces
• Relatively high flash point for safer handling in production environments
• 16.46 L pail format reduces per-litre cost for high-volume applications

Compatible Hardeners

Select a hardener based on working time requirements and ambient temperature:

• West System C205 Hardener – 814 ml — Standard cure, all-season versatility
• West System C205 Hardener – 3.56 L — Large-format hardener to match production resin volumes
• West System C209SB Extra Slow Hardener – 1.24 L — Extended pot life for large pours and warm-weather lamination
• West System C207SA Special Clear Hardener – 315 ml — For clear-coat and bright-finish applications

C105 Resin Family – Size Comparison

• West System C105A – 946 ml — Targeted repairs and small jobs
• West System C105B – 3.74 L — Mid-size for extended single-project use
• West System C105C – 16.46 L — Production and boatyard scale (this item)

Parts Desk Insights

Best Use Cases: The C105C pail is the right choice for boatyards, professional repair shops, and serious builders running multi-day or multi-phase projects where consistent resin supply is critical. It eliminates the need to open multiple smaller containers mid-job — reducing mix ratio risk and material waste. Ideal for full hull encapsulation schedules, large fairing jobs, production lamination runs, and any application where purchasing smaller units would be cost-inefficient or logistically disruptive.

Tip: Decant into smaller working containers as needed to minimize moisture exposure to the bulk supply. Always seal the pail tightly between sessions. Use a calibrated metering pump for accurate hardener ratios — at this volume, ratio errors are costly. Pair with a large-format hardener such as the West System C205 Hardener – 3.56 L to maintain proportional supply across the project.