West Systems Epoxy Adhesives
Why WEST SYSTEM Epoxy Adhesives Stand Apart
WEST SYSTEM has been synonymous with high-performance epoxy adhesives since 1969, when the Gougeon Brothers—sailors, builders, and chemists—founded the brand in Bay City, Michigan. Their mission was straightforward: engineer a two-part epoxy system precise enough for ocean-going composite structures, yet accessible enough for the dedicated DIYer. More than five decades later, that philosophy still defines every product in the WEST SYSTEM epoxy adhesives lineup.
The 105 System: The Foundation of Versatile Bonding
At the heart of the WEST SYSTEM approach is the iconic 105 Epoxy Resin. Unlike single-formula competitors, the 105 System pairs with a family of hardeners—205 Fast, 206 Slow, 207 Special Clear, and 209 Extra Slow—letting you dial in working time to match your project conditions and ambient temperature. This modular design means the same base resin can go from a quick structural repair on a warm summer afternoon to a long, deliberate laminating session in a cool shop. The calibrated metering pump system eliminates the guesswork of mix ratios, delivering clean, accurate proportions with every stroke.
Once cured, the 105 System delivers exceptional moisture resistance, forming load-bearing bonds that routinely meet or exceed the strength of the surrounding substrate. It bonds reliably to wood, fiberglass, carbon fiber, Kevlar, and most metals—making it a go-to adhesive for marine construction and repair, composite fabrication, and serious woodworking alike.
G/flex: Toughened Epoxy for Difficult Substrates
For situations where flexibility and peel resistance matter as much as raw strength, WEST SYSTEM's G/flex Epoxy is in a class of its own. Available in a liquid formulation (G/flex 650) and a pre-thickened adhesive (G/flex 655), both at a simple 1:1 mix ratio, G/flex is engineered to grip metals, plastics, glass, masonry, fiberglass, and difficult-to-bond woods—even damp or wet surfaces. Its toughened chemistry makes it particularly well-suited for repairs where joints must survive vibration, impact, or thermal cycling.
Six10 and Specialty Epoxy Options
Rounding out the adhesive lineup are WEST SYSTEM's specialty products, including Six10 Thickened Epoxy Adhesive—a cartridge-based, structural adhesive that combines the proven strength and reliability of the 105 System in a convenient dispensing format for bonding, filleting, and fairing. All WEST SYSTEM specialty epoxies are cure-compatible with one another and with the 105 System, so experienced builders can blend formulas to fine-tune properties like working time and toughness without sacrificing bond integrity.
Engineering Depth Behind Every Formula
What sets WEST SYSTEM apart from off-the-shelf industrial epoxies is the depth of engineering behind each formula. The brand's performance criteria are defined through rigorous testing and direct experience with high-performance composite structures—from racing sailboats to wooden boat restorations. The result is an adhesive system that balances mechanical strength, moisture resistance, adhesion breadth, and workability in a way that generalist products rarely achieve.
Whether you're tackling a fiberglass hull repair, bonding hardware through a composite deck, cold-molding a new hull, or restoring a classic wooden vessel, WEST SYSTEM epoxy adhesives bring professional-grade chemistry to the task. Browse the full selection below to find the right resin, hardener, and specialty adhesive for your next project.