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West System 205A Fast Hardener for 105 Epoxy Resin

Manufacturer

West Systems

<p>Founded in 1969 by brothers Meade, Joel, and Jan Gougeon in Bay City, Michigan, West System emerged from a shared passion for building sailboats and iceboats. What began as experiments with epoxy technology in the late 1950s evolved into a collaboration with chemists at Dow Chemical Company's epoxy lab, resulting in formulations that could serve as both adhesive and coating. The formulations developed became the basis of the WEST SYSTEM group of products introduced in 1971, revolutionizing wooden boat construction and marine bonding applications.</p><h3>Pioneering Marine Epoxy Technology</h3><p>West System Epoxy was created by Gougeon Brothers—sailors, builders and formulators who know the engineering and chemistry required for high-performance composite structures. In 1970, the brothers launched Adagio, the first large, all epoxy bonded and sealed wooden boat built without the use of fasteners, demonstrating the structural integrity their epoxy formulations could achieve. For over 50 years, WEST SYSTEM epoxy has been the marine industry's trusted brand for versatile, high-quality epoxy resin systems, expanding from marine applications to woodworking, composite construction, and general repair.</p><h3>Comprehensive Product Lineup</h3><p>The company's signature <a href="/7644-west-systems-west-system-products-201176">West System Products</a> include their renowned two-part epoxy systems featuring 105 Epoxy Resin paired with specialized hardeners, fillers, and additives. West System Epoxy is a versatile, high-quality, two-part epoxy easily modified for a wide range of coating and adhesive applications, especially suited for marine applications requiring superior moisture resistance and high strength. The modular system allows users to customize working time, cure characteristics, and physical properties by selecting different hardeners and incorporating various fillers for specific bonding, fairing, or filleting applications.</p><p>Beyond traditional epoxy resins, West System offers specialized solutions like <a href="/7644-west-systems-vinyl-sealant-repair-kit-19328">Vinyl Sealant Repair Kits</a> designed for quick repairs and sealing applications. The brand also provides an extensive selection of <a href="/7644-west-systems-maintenance-parts-accessories-200647">Maintenance Parts & Accessories</a> including metering pumps, mixing pots, application tools, and roller covers specifically engineered for epoxy work.</p><h3>Engineering Excellence and Quality Standards</h3><p>Not all epoxies are created equal—epoxy brands can vary widely in formulations, quality of raw materials, and suitability for marine environments, and it's much more difficult to balance all of the physical and mechanical properties necessary for a versatile, high-quality marine epoxy. West System epoxies are marine-grade and undergo rigorous testing to ensure their strength, making them suitable for applications ranging from boat building and repair to composite construction, woodworking, and structural bonding in demanding environments.</p><p>As an employee-owned, family run organization operating since 1969, West System maintains the same commitment to quality and innovation that drove the Gougeon brothers' original experiments. Their products bond tenaciously to wood, fiberglass, carbon fiber, metals, and many plastics, providing excellent moisture resistance and creating durable, long-lasting repairs and construction that withstand the harshest conditions.</p>

Part Number

205A
06/01/2036 7:03 AM
Sale Price

$36.40

In Stock (10+)

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Usually delivered within 2 days

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No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

WEST SYSTEM 205 Fast Hardener is a medium-viscosity epoxy curing agent designed for general coating, bonding, and laminating applications. Formulated to produce a rapid cure that develops physical properties quickly at room temperature, it is an ideal choice for a wide range of marine, woodworking, and composite repair projects.

When blended with WEST SYSTEM 105 Epoxy Resin at a 5:1 ratio (resin to hardener), the cured mixture yields a rigid, high-strength, moisture-resistant solid with excellent bonding and coating properties. The 205 Fast Hardener is especially well-suited for use at lower temperatures, with a minimum recommended working temperature of 40°F (4°C).

Key Features:

  • Rapid cure: pot life of 9–12 minutes at 72°F (22°C)
  • Cures to a solid state in 6–8 hours; reaches maximum strength in 1–4 days
  • Medium-viscosity formula for easy dispensing, mixing, and application
  • Bonds to wood fiber, fiberglass, reinforcing fabrics, and a variety of metals
  • Produces a rigid, high-strength, moisture-resistant cured solid
  • Effective for coating, bonding, barrier coating, and fabric lamination
  • Compatible with WEST SYSTEM fillers, pigments, and additives for custom formulations
  • Works in cold-weather applications down to 40°F (4°C)
  • Not intended for clear coating applications

Use the WEST SYSTEM 300 Mini Pumps (sold separately) to dispense 105 Resin and 205 Fast Hardener at the correct 5:1 ratio automatically. For best results in cold weather, warm both the resin and hardener before use to reduce viscosity and ensure thorough mixing. Store at room temperature with containers closed to prevent contamination.

Products specifications

Capacity

0.44

Type

Hardener

Best Use

Fast Hardener for 105 Epoxy Resin

Cure Time

6 to 8 Hours (Working Time 60-70 Minutes) at 72 F

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