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West System Fillers
403, 404, 405, 406, 407 & 410

West System 403 Microfibers

West System 403 Microfibers



West System 403 Microfibers, a fine fiber blend, is used as a thickening additive with resin/hardener 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.

Color: Off-White.

Mixing Percentages by weight with 105 Resin.

Adhesive: 7%

Filling & Fairing: 16%


Product Datasheet

West System 404 High-Density Filler

West System 404 High-Density Filler



404 High-Density filler is a thickening additive developed for maximum physical properties in hardware bonding where high-cyclic loads are anticipated.

It can also be used for filleting and gap filling where maximum strength is necessary.

Color: off-white.

Mixing consistencies: filler weights for 1.2lt of 105/205 mixed Resin.

Ketchup: 430g

Mayonnaise: 505g

Peanut Butter: 650g


Product Datasheet

West System 405 Filleting Blend Filler

West System 405 Filleting Blend Filler



This strong, wood-toned filler is ideal for use in glue joints and fillets on naturally finished hardwoods. It mixes easily with epoxy and lets you create fillets that are smooth and require little sanding.

West System 405 can be used to modify the shade of other West System fillers.

Color: Brown.

Mixing Percentages by weight with 105 Resin.

Adhesive: 20%

Filling & Fairing: 25%


West System 406 Colloidal Silica Filler

West System 406 Colloidal Silica Filler



406 Colloidal Silica is a thickening additive used to control the viscosity of the epoxy and prevent epoxy runoff in vertical and overhead joints.

406 is a very strong filler that creates a smooth mixture, ideal for general bonding and filleting.

It is also our most versatile filler.

Often used in combination with other fillers, it can be used to improve the improve strength, abrasion resistance, and consistency of fairing compounds, resulting in a tougher, smoother surface.

Color: Off-White.

Mixing Percentages by weight with 105 Resin.

Adhesive: 5%

Filling & Fairing: 8%


Product Datasheet

West System 407 Low-Density Filler

West System 407 Low-Density Filler


407 Low-Density filler is a blended microballoon-based filler used to make fairing putties that are easy to sand or carve.

Reasonably strong on a strength-to-weight basis.

Color: Dark Red/Brown.

Mixing Percentages by weight with 105 Resin.

Adhesive: 30%

Filling & Fairing: 35-40%


Product Datasheet

West System 410 Microlight Low-Density Filler

West System 410 Microlight Low-Density Filler



410 Microlight is the ideal low-density filler for creating a light, easily-worked fairing compound especially suited for fairing large areas.

Microlight mixes with greater ease than 407 Low-Density filler or microballoons and is approximately 30% easier to sand.

It feathers to a fine edge and is also more economical for large fairing jobs.

Not recommended under dark paint or other surfaces subject to high temperatures. Cures to a tan color.

Product Datasheet