WEST SYSTEM Epoxy fillers are used to thicken the basic epoxy resin/hardener mixture for specific applications. Each epoxy filler possesses a unique set of physical characteristics, but they can generally be categorized as either Adhesive (high-density) for bonding applications or Fairing (low-density) for sanding and fairing applications. Adding these filling agents to blended epoxy resin and hardener allows you to control the consistency of the epoxy, bridge gaps in joints, create either strong or sandable fillets with epoxy, or alter the cured density of epoxy making it easier to sand smooth.
| Uses & Characteristics with epoxy resin/hardener mixture |
Adhesive Fillers
⇐ Highest Density/Highest Strength |
Fairing Fillers
Lowest Density/Easiest Sanding ⇒ |
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| Bonding Hardware with Epoxy —Increase load capacity —Maximum strength |
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| General Bonding with Epoxy —Structural gap filler —Strong, gap-filling |
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| Bonding with Fillets with Epoxy —Increase joint bonding area —Structural brace between parts —Smooth, strong |
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| Laminating with Epoxy —Bond layers —Gap-filling, strong |
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| Fairing with Epoxy —Fills voids —Easily sanded —Gap filling |
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Adhesive Epoxy Fillers
Adhesive fillers are suitable for most epoxy bonding situations especially with high-density materials like hardwoods and metals. Adhesive filler mixtures cure to a strong, hard-to-sand cured epoxy plastic useful in structural applications like general bonding, filleting and hardware bonding.
Fairing filler epoxy mixtures cure to light, easily sandable material that is generally used for cosmetic or surface applications like shaping, filling or fairing. Seal all faired surfaces with epoxy before painting.
Epoxy Additives
Additives are used to give epoxy additional physical properties when used as a coating. Although additives are blended with mixed epoxy in the same two-step process as fillers, they are not designed to thicken the epoxy. See Additives & Pigments. Follow the mixing instructions on the individual additive containers when blending these products into your epoxy resin/hardener mixture.
General use filler selection may be based on the epoxy handling characteristics you prefer. Fillers may also be blended to create epoxy mixtures with intermediate characteristics.
Filler Buying Guide
Quantity of mixed epoxy required for consistency:
| WEST SYSTEM
Epoxy Filler |
Package Size |
Package Weight |
Epoxy filled to Catsup Consistency  |
Epoxy filled to Mayonnaise Consistency  |
Epoxy filled to Peanut Butter Consistency  |
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403-9 403-28 403-B |
6.0 oz 20.0 oz 20.0 lb |
3.8 qt 3.2 gal 48.0 gal |
2.5 qt 2.0 gal 32.0 gal |
1.0 qt .9 gal 15.3 gal |
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404-15 404-45 404-B |
15.2 oz 43.0 oz 30.0 lb |
1.1 qt 3.2 qt 8.5 gal |
.8 qt 2.4 qt 6.3 gal |
.6 qt 1.8 qt 4.7 gal |
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405 | 11.0 oz | .8 qt | .6 qt | .5 qt |
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406-2 406-7 406-B |
1.7 oz 5.5 oz 10.0 lb |
1.3 qt 1.1 gal 27.0 gal |
.9 qt 3.0 qt 16.0 gal |
.5 qt 1.7 qt 6.0 gal |
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407-5 407-15 407-B |
4.0 oz 12.0 oz 14.0 lb |
.5 qt 1.7 qt 6.0 gal |
.4 qt 1.3 qt 4.8 gal |
.3 qt 1.0 qt 3.7 gal |
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410-2 410-7 410-B |
2.0 oz 5.0 oz 4.0 lb |
1.2 qt 3.0 qt 8.9 gal |
.9 qt 2.4 qt 7.2 gal |
.7 qt 1.8 qt 5.6 gal |