West System Microfibers

WEST SYSTEM Microfibers – The Ultimate Epoxy Thickening Additive for Marine Bonding

Achieve professional-grade, high-strength bonds on your marine projects with WEST SYSTEM 403 Microfibers. An essential component for any boat builder or maintenance expert´s toolkit, this high-performance additive transforms your WEST SYSTEM epoxy into a powerful, gap-filling adhesive, ensuring your woodworking repairs and constructions are both durable and seamless. It is the go-to solution when you need to increase the strength and versatility of your epoxy for demanding marine applications.

A Fine Fiber Blend Used As A Thickening Additive That Builds Volume Quickly And Blends Easily To Create A Multi-Purpose Adhesive Especially For Bonding Wood.

Epoxy Thickened With Microfibers Has Good Gap Filling Qualities While Retaining Excellent Wetting/Penetrating Capability.

Cures To An Off-White Color.

Create Powerful, Multi-Purpose Adhesives

WEST SYSTEM Microfibers are engineered to significantly enhance the properties of liquid epoxy. When blended into a WEST SYSTEM resin and hardener mix, this fine fiber blend creates a thick, easy-to-manage paste that serves as a robust general-purpose adhesive. Its primary strength lies in bonding wood, where the thickened epoxy penetrates the wood grain for a tenacious grip that is often stronger than the wood itself. This makes it an indispensable product for structural repairs, boat building, and general marine carpentry where bond strength is paramount.

Superior Gap-Filling Without Sacrificing Strength

One of the greatest challenges in boat maintenance and construction is dealing with imperfect joints and gaps. Epoxy thickened with 403 Microfibers excels at filling these voids, creating a solid, load-bearing mass that ensures complete contact between surfaces. Unlike some fillers that can compromise penetration, this blend maintains the epoxy’s excellent wetting characteristics. This means the adhesive not only fills the gap but also thoroughly soaks into the surrounding substrate, creating an integrated, cohesive bond that effectively resists stress, vibration, and moisture intrusion. The resulting mixture has a non-sagging consistency, making it ideal for vertical and overhead applications.

Effortless Mixing and Smooth Application

Designed for efficiency and ease of use, WEST SYSTEM Microfibers blend quickly and smoothly into epoxy, allowing you to achieve your desired consistency with minimal effort. The additive builds volume rapidly, letting you create a substantial adhesive paste without a large amount of filler. This results in a creamy, workable putty that is easy to apply with a trowel or putty knife, spreading evenly for consistent coverage. Once cured, the epoxy solidifies into a durable, off-white material that is tough, resilient, and ready for sanding and finishing. Whether you are crafting fillets, bonding hardware, or performing structural repairs, the smooth workability ensures a clean and professional result every time. As part of the renowned WEST SYSTEM product line, 403 Microfibers deliver the reliability and proven performance trusted by marine professionals worldwide