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West System Resins and Hardeners

Epoxy Resin 105

Epoxy Resin 105

Resin 105 is the base material of the West System product family from which all possible compounds are made. It is a clear amber-colored epoxy resin, low viscosity that, when mixed with one of the West System hardeners, is formulated to pre-glue wood fiber, fiberglass, and a variety of metals. It can be cured over a wide temperature range to form a high strength solid with excellent moisture resistance. An excellent adhesive, West System epoxy fills voids and gaps when modified with West System additives, and can be sanded and shaped afterwards. When applied, Resin 105 has a relatively high flash point, making it safer to use than polyesters, and lacks solvent odors and vapors. For every resin container size, there is a corresponding hardener container and a mini dosing pump. When purchasing resin, hardener, and mini pumps, verify that all items are labeled with the same size letter (i.e.: A, B, C, or E).
Catalysts - Hardener 205 fast

Catalysts - Hardener 205 fast

Hardener 205 is used in most situations to produce a fast cure resulting in an epoxy that quickly develops its physical properties. When mixed at a ratio of five parts by weight of Resin 105 to one part by weight of Hardener 205, the cured resin/hardener mix produces a high strength rigid solid with excellent cohesion properties and provides an exceptional moisture barrier, with excellent bonding and coating properties. Note: Resin/hardener ratio - 5:1. Pot life at 25°C: 10 to 15 minutes. Solid cure at 21°C: 5 to 7 hours. Full strength cure at 21°C: 5 to 7 days. Minimum recommended working temperature: 5°C
Hardener 206 Slow

Hardener 206 Slow

When this low-viscosity curing agent is mixed with Resin 105 at a ratio of five parts resin by weight to one part Hardener 206 by weight, the cured resin/hardener mix produces a high strength rigid solid resistant to moisture, excellent as an adhesive for bonding and coating. Under ideal working conditions, it can be used to obtain extended assembly times. Note: Resin/hardener ratio - 5:1. Pot life at 25°C: 20 to 30 minutes. Solid cure at 21°C: 9 to 12 hours. Full strength cure at 21°C: 5 to 7 days. Minimum recommended working temperature: 16°C.
Hardener 207 Special Coatings

Hardener 207 Special Coatings

The Special Coatings Hardener 207 has been formulated for use with West System Resin 105 for coatings that require an extremely clear finish. This hardener also provides excellent adhesion for bonding applications. The 207 contains a UV inhibitor to protect the 105/207 mix against sunlight. However, the cured epoxy surface still requires long-term UV protection with marine paint or a two-component varnish with UV filter. Note: Resin/hardener ratio: 3:1 Pot life at 25°C: 20 to 30 minutes. Solid cure at 21°C: 9 to 12 hours. Full strength cure at 21°C: 5 to 7 days. Minimum recommended working temperature: 16°C
Hardener 209 Extra Slow

Hardener 209 Extra Slow

Extra Slow Hardener 209 is formulated for use with Resin 105 in extremely warm and/or humid conditions, for general bonding and coating applications, or when extended working times at room temperature are desired. A 105/209 mix provides approximately twice the pot life and working time of Slow Hardener 206 and a suitable pot life up to 43°C. It forms a transparent amber solid with good physical properties and good moisture resistance for bonding and coating applications. Note: Resin/hardener ratio - 3:1 Pot life at 25°C: 75 to 90 minutes. Solid cure at 21°C: 20 to 24 hours. Solid cure at 35°C: 6 to 8 hours. Full strength cure at 21°C: 5 to 9 days. Minimum recommended working temperature: 18°C.
Epoxy Dispensers - 301 Mini Pump

Epoxy Dispensers - 301 Mini Pump

Designed for precise and convenient dosing of Resin 105 and West System Hardeners 205 or 206. The mini pumps ensure exact measurement of the resin/hardener mixture and eliminate problems associated with manual measuring. The pumps attach directly to resin and hardener containers and have been calibrated to deliver the correct ratio of five parts resin by weight to one part hardener by weight (5:1) with a single pump stroke each. When resin and hardener are in continuous use, the pumps can remain mounted on the containers. A full stroke of each pump delivers approximately 25 grams of resin and approximately 5 grams of hardener. Warning: Do not use with hardeners 207 or 209.
303 Mini Pump for special mixing ratio

303 Mini Pump for special mixing ratio

Designed for use with West System Hardeners 207 and 209 for special applications. The mini pumps attach directly to resin and hardener containers and have been calibrated to deliver the correct ratio of three parts resin by weight to one part hardener (3:1) by weight with a single pump stroke each. A full stroke of each pump delivers approximately 25 grams of resin and approximately 8.5 grams of hardener. Warning: Do not use with hardeners 205 or 206.
Bonding Additives - 403 Microfibers

Bonding Additives - 403 Microfibers

A blend of cotton cellulose fibers used as a thickening additive for bonding applications. Epoxy thickened with microfibers provides good pre-bonding or substrate impregnation and excellent void filling properties. Application instructions: Add between 4% and 16% by weight of 403 to a West System epoxy mix.
404 High Density Filler

404 High Density Filler

A filler developed to maximize accessory bond strength when high cyclic loads are expected. It can also be used for filleting and gap filling applications. Mixing instructions: Can be added to resin/hardener at 35% to 60% by weight, depending on the desired viscosity.
405 Filleting Mix

405 Filleting Mix

Consists of a mix of cellulose fibers and other fillers for filleting applications when a natural colored interior finish is desired. Application instructions: Water- or alcohol-based dyes can be added to adjust the color. Add 15% to 25% by weight to the epoxy mix.
406 Colloidal Silica

406 Colloidal Silica

A general-purpose thickening additive suitable for bonding, gap filling, and filleting. Can be used to prevent resin slippage when applied to vertical surfaces or ceilings and to control epoxy viscosity. Mixing instructions: Add 3% to 8% by weight to the resin/hardener mix. Often used in combination with other fillers to control working characteristics of an epoxy mix, e.g., to improve consistency of fairing compounds.
Fairing Additives - 407 Low Density Filler

Fairing Additives - 407 Low Density Filler

A microsphere-based filler blend used to make easy-to-sand fairings while maintaining a good strength-to-weight ratio. Mixing instructions: Add between 20% and 40% by weight to a West System epoxy mix. After curing, the color is reddish-brown.
410 Microlight

410 Microlight

Microlight 410 is a low-density filler ideal for creating a lightweight, easy-to-handle putty especially suitable for large surfaces. Microlight mixes easily with the epoxy mix in proportions of 7% to 16% by weight, and when cured, it is easier to sand than any other filler system. It allows for fine chamfered edges and is more cost-effective than other fillers. Not recommended for high-temperature applications and should not be coated with dark colors. After curing, the color is beige.
Additives - 420 Aluminum Powder

Additives - 420 Aluminum Powder

Add between 5% and 10% by volume to provide UV protection in areas not covered by other coatings and as a base for subsequent painting. It significantly increases the hardness of the coated surface.
421 Fire Retardant

421 Fire Retardant

A fine white powder added to epoxy in a one-to-one weight ratio. The cured material is a fire-retardant compound designed for use in engine areas or kitchens. Fire Retardant 421 greatly increases the viscosity of the epoxy and the compound must be applied with a spatula or similar tool.
422 Moisture Barrier

422 Moisture Barrier

A proprietary blend designed to improve the moisture resistance of West System epoxy and to combat osmosis. It is an excellent additive as a barrier coating to prevent bubbles in gelcoat and also improves abrasion resistance. Application instructions: Add 20% to 25% by weight of 422 to the mixed epoxy.
423 Graphite Powder

423 Graphite Powder

A fine black powder added to West System epoxy (10% by volume) to produce an exterior low-friction coating with increased abrasion resistance, durability, and wear resistance. Epoxy/graphite is a common coating for rudders and keels or the bottom surface of racing boats in the yard. The epoxy/graphite mix can also be used in teak deck construction to simulate traditional caulking and to protect epoxy from sunlight. 423 Graphite Powder ref. WS 423 Available in 200 gr and 3 kg packaging.