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WEST System

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WEST System

For over 25 years, West System have been pioneers in epoxy formulation and epoxy composite boat construction. West System Epoxy was introduced back in the early 1970's and since then have been known worldwide for their consistent high quality epoxy products. Through the years, the skill and knowledge gained from racing, boatbuilding and scientific research have kept West System products at the forefront of epoxy composite technology. West System epoxy is the leading epoxy manufacturer for boat repair, boat building, fiberglass repair etc and is a versatile, 2-part, marine-grade epoxy that bonds and coats fiberglass, wood, metal, fabrics and other composite materials to provide superior strength and moisture resistance.

Balanced Performance

West System Epoxy Performance

West System epoxy was designed for boatbuilding and repair by experienced builders and formulators who know the chemistry required for high-performance composite structures. They have had more than thirty years of developing marine epoxies and continue to formulate, test and improve their resin and hardeners to create the most reliable and well balanced epoxy system available. All of West Systems resin and hardener formulas, ingredients and combinations are tested thoroughly to insure that any change in formula will improve one or more of a product's characteristics without diminishing any characteristics. They test to compare fatigue strength, compression strength, glass transition temperature, and peak exotherm. Qualified samples are then tested for hardness, tensile strength, tensile elongation, tensile modulus, flexural strength, flexural modulus, heat deflection temperature, impact resistance and moisture exclusion effectiveness.

The 105 System

Epoxy Resins and Hardeners

West System 105 Resin & Hardener This epoxy cures to a high-strength plastic solid at room temperature. This is a highly moisture-resistant plastic that is capable of adhering to a wide range of materials, therefore it is ideal for projects that require water and chemical resistance, and strong physical properties for structural bonding. West System has a large offering of hardeners and additives that allow you to tailor the mixture's handling characteristics and physical properties of the cured epoxy to suit your individual working condition and application.


West System Filler Fillers are used to thicken the resin/hardener mixture for specific applications. Fillers can be categorized into two general catagories, adhesive (high-density) and fairing (low-density) fillers. When bonding higher-density materials like hardwoods and metals you should use a higher-density filler. Adhesive fillers are suitable for most bonding applications, although choosing a filler for general use may be determined based on the handling characteristics you prefer and may also be blended to create mixtures with intermediate characteristics.
  • Adhesive fillers - Cure to a strong, hard-to-sand plastic, useful in structural applications like bonding, filleting and hardware bonding
  • Fairing filler - Cure to a light, easily sandable material, used for cosmetic or surface applications like shaping, filling or fairing


West System Additives When epoxy is being used at a coating, additives are blended into the mixed epoxy to alter the physical properties, like color, abrasion resistance or moisture resistance of cured epoxy. In general, coloring agents can be added to the mixed epoxy up to 5% by volume with minimal effect of the cured epoxy's strength, however, you should always make a test sample to check desired color and opaqueness and for proper cure.

West System Specialty Epoxies

Six10 Epoxy Adhesive

West System Six10 Six10 is a thickened epoxy adhesive that combines the strength and reliability of a two-part epoxy with point-and-shoot convenience. The self-metering coaxial cartridge dispenses a gap-filling structural epoxy that bonds tenaciously to wood, metals, fiberglass and concrete. The thinning properties of this product make it "thinner" as it's worked, and can be easily tooled into a non-sagging fillet or used to wet out light to moderate reinforcing fabrics like fiberglass. The hardener provides a long open time but has fast thru-cure.

G/Flex Epoxy

West System G/Flex Epoxy This specialty product is a toughened, versatile, liquid epoxy for permanent waterproof bonding of fiberglass, ceramics, metals, plastics, damp and difficult-to-bond woods. G/Flex elasticity allows it to be a bit more flexible than standard epoxies and polyester, but much stiffer that adhesive sealants, which gives it the ability to make structural bonds that can absorb the stress of expansion, contraction, shock and vibration and is ideal for bonding dissimilar materials.

G/5 Adhesive

West System G/5 Adhesive G/5 is an easy-to-use, 2-part resin/hardener system for quick repairs, tooling and general bonding. You can use G/5 in spot applications to hold parts in position while standard epoxy bonds cure. Bonds to wood, fiberglass and metal. It is not recommended for long-term bonds subject to high loads or moisture.

Vacuum Bagging

West System Vacuum Bagging Vacuum bagging is a clamping system that is used for laminating a wide range of fabrics, core materials and veneers. There are many advantages to using vacuum bagging over conventional clamping, it uses atmospheric pressure to deliver firm even clamping pressure over the entire surface area, regardless of the type or quantity of material being laminated. By laminating over simple molds, composites can be molded into a wide range of functional shapes.

Product Selection with 105 System

Step 1.
Start with 105 resin, use 300 Mini Pumps for convenient and accurate measuring.

Step 2.
Mix with one of four of West System's hardeners. Select a hardener for its intended use and for the cure speed best suited for your job in the temperature range in which you are working.

Step 3.
Add one of West Systems fillers to thicken the mixture as needed. Select a filler for its handling characteristics or cured physical properties. Or, add one of West System's additives to provide specific coating properties. West System Product Selection

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