West Systems 407B Low Density Filler - 14 Lb

West Systems

<h3>About WEST SYSTEM Epoxy</h3><p><strong>WEST SYSTEM</strong> has been the benchmark for marine-grade epoxy chemistry since 1969, when the Gougeon Brothers — sailors, builders, and chemists by trade — founded the company in Bay City, Michigan. Their goal was straightforward: engineer an epoxy that could stand up to the relentless demands of high-performance marine environments, from the stresses of ocean-going hulls to the moisture cycles of wooden decks. More than five decades later, that mission still drives every product in the WEST SYSTEM lineup.</p><p>At the heart of the brand is the legendary <strong>105 System</strong> — a modular approach to epoxy that begins with a single, clear, low-viscosity base resin and pairs it with one of several hardeners to control cure speed. As one of the most versatile materials available for boat repair and construction, the 105 System lets builders and repair professionals dial in exactly the working time, viscosity, and final properties they need without compromising performance. Whether you are repairing gelcoat cracks, laminating fiberglass cloth, fairing a hull, or sealing a wooden structure against moisture intrusion, the system adapts.</p><p>WEST SYSTEM's <a href="/7644-west-systems-epoxy-resin-200380">epoxy resin</a> products serve as the foundation of nearly every project, bonding strongly to wood, fiberglass, metal, and a broad range of composite materials. Alongside the core resin line, the brand offers an equally deep selection of epoxy resin kits and bundles that pair resin with the appropriate hardener and metering pumps — an ideal starting point for anyone new to the system or working on a specific repair type. For applications that demand a ready-to-use, pre-thickened solution, WEST SYSTEM's epoxy adhesives — including the G/Flex, Six10, and G/5 product lines — deliver structural bonding in convenient formats suited to everything from fiberglass and ceramic repairs to plastic and metal bonding.</p><p>Beyond resins and adhesives, WEST SYSTEM rounds out its ecosystem with a comprehensive range of fillers, additives, reinforcing fabrics, metering pumps, and application tools. Fillers like 403 Microfibers and 406 Colloidal Silica let users fine-tune mixed epoxy into adhesive fillets, gap-filling compounds, or fairing pastes. Specialty additives such as 423 Graphite Powder produce low-friction coatings, while pigments allow color matching on finished surfaces.</p><p>Although WEST SYSTEM built its reputation in the boatbuilding world, the same properties that make it exceptional in a marine environment — moisture resistance, structural strength, and adhesion to difficult substrates — translate naturally to home repair, restoration projects, and general composite fabrication. It is equally at home reinforcing a rotten window frame, restoring antique furniture, or laminating a brand-new hull.</p><h3>Why Builders Trust WEST SYSTEM</h3><ul><li><strong>Proven since 1969</strong> — decades of real-world use in boatyards, by professional surveyors, and serious DIY builders worldwide</li><li><strong>Modular 105 System</strong> — one base resin, multiple hardeners, and a full range of fillers and additives for complete project flexibility</li><li><strong>Marine-grade formulation</strong> — engineered specifically to withstand water, load, vibration, and weather in harsh environments</li><li><strong>Broad material compatibility</strong> — bonds to wood, fiberglass, composites, metal, ceramics, and many plastics</li><li><strong>Complete system approach</strong> — resin, hardeners, fillers, fabrics, tools, and repair kits all designed to work together</li><li><strong>Extensive technical support</strong> — backed by the <em>Epoxyworks</em> publication and detailed product guides for professional and DIY users alike</li></ul>