---
product_id: 20049723
title: "WEST System® 404 High-Density Epoxy Filler | Strong Structural Thickening Additive for Epoxy Resin Bonding and Filleting | Made in The USA"
brand: "west system"
price: "20177 kr"
currency: ISK
in_stock: true
reviews_count: 9
category: "West System"
url: https://www.desertcart.is/products/20049723-west-system-404-high-density-epoxy-filler-strong-structural-thickening
store_origin: IS
region: Iceland
---

# Gap-filling, non-slumping paste High-density strength boost Proudly made in the USA WEST System® 404 High-Density Epoxy Filler | Strong Structural Thickening Additive for Epoxy Resin Bonding and Filleting | Made in The USA

**Brand:** west system
**Price:** 20177 kr
**Availability:** ✅ In Stock

## Summary

> 🛠️ Elevate your epoxy game — strong bonds, zero sag, all-American quality!

## Quick Answers

- **What is this?** WEST System® 404 High-Density Epoxy Filler | Strong Structural Thickening Additive for Epoxy Resin Bonding and Filleting | Made in The USA by west system
- **How much does it cost?** 20177 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/20049723-west-system-404-high-density-epoxy-filler-strong-structural-thickening)

## Best For

- west system enthusiasts

## Why This Product

- Trusted west system brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Gap-Filling Power:** Creates thick, non-sagging fillets that bridge large gaps without tight joinery
- • **Customizable Viscosity:** Adjust thickness from slurry to paste by varying filler amount for perfect application
- • **Maximize Bond Strength:** Enhances epoxy adhesion for hardware & stud bonding under high cyclic loads
- • **Versatile Compatibility:** Works seamlessly with WEST SYSTEM 105 resin, 20X hardeners, G/flex 650, and G/5 adhesives
- • **Durable & Water Resistant:** Cures to a tough, off-white finish that withstands moisture and structural stress

## Overview

WEST System® 404 High-Density Epoxy Filler is a premium thickening additive designed to maximize epoxy resin strength and durability. Ideal for structural filleting, hardware bonding, and gap filling, it produces a non-slumping, water-resistant paste compatible with multiple WEST SYSTEM epoxies. Made in the USA, it offers adjustable viscosity for tailored applications, ensuring superior performance in demanding woodworking and repair projects.

## Description

WEST System® 404 High-Density Epoxy Filler | Strong Structural Thickening Additive for Epoxy Resin Bonding and Filleting | Made in The USA: Boating Equipment: desertcart.com: Tools & Home Improvement

Review: Epoxy filler - Nice addition to west epoxy, thickens mixture and fills gaps, just as advertised.
Review: great products - west system is great products

## Features

- High-density epoxy thickening additive for strength – Made in the USA WEST SYSTEM 404 High-Density Filler is used to maximize epoxy’s adhesive properties in hardware bonding and other applications where high cyclic loads or maximum bond strength are required.
- Excellent for hardware and stud bonding – Even small amounts added to epoxy resin and hardener reduce creep in the cured epoxy, making this filler well suited for hardware, fastener, and stud bonding applications.
- Creates strong, non-slumping epoxy mixtures – Mixed with epoxy, this filler produces a gap-filling adhesive capable of forming structural fillets or bridging large gaps without sagging, reducing the need for tight joinery.
- Compatible with multiple WEST SYSTEM epoxies – 404 High-Density Filler can be blended with WEST SYSTEM 105 resin and 20X hardeners, G/flex 650 epoxy, or G/5 five-minute adhesive and cures to an off-white color.
- Viscosity controlled by filler amount – The amount added determines epoxy thickness, from a loose slurry to thicker mixes. For best results, use only enough filler to bridge gaps without trapping air and avoid overfilling the mixing cup.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0006JJAU6 |
| Best Sellers Rank | #119,383 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #158 in Wood Filler |
| Brand | West System |
| Color | off-white |
| Date First Available | October 1, 2001 |
| Item Form | Paste |
| Item Package Quantity | 1 |
| Item Volume | 46 Fluid Ounces |
| Item Weight | 3.3 pounds |
| Item model number | 404-45 |
| Manufacturer | Gougeon Brothers, Inc. |
| Material | epoxy; filler |
| Number of Pieces | 1 |
| Package Information | Aerosol Can |
| Product Dimensions | 21.25 x 16 x 11.5 inches |
| Special Feature | Strong |
| Specific Uses For Product | Carpentry, Gap Filling, Hardware Bonding, Repair, Structural Fillets, Woodworking |
| UPC | 811343011413 |
| Unit Count | 43.0 Ounce |
| Viscosity | Adjustable by adding filler |
| Viscosity Level | High |
| Water Resistance Level | Water Resistant |

## Product Details

- **Brand:** West System
- **Item Form:** Paste
- **Material:** epoxy; filler
- **Special Feature:** Strong
- **Specific Uses For Product:** Carpentry, Gap Filling, Hardware Bonding, Repair, Structural Fillets, Woodworking

## Images

![WEST System® 404 High-Density Epoxy Filler | Strong Structural Thickening Additive for Epoxy Resin Bonding and Filleting | Made in The USA - Image 1](https://m.media-amazon.com/images/I/71wtb8ECQOL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Epoxy filler
*by B***I on December 9, 2023*

Nice addition to west epoxy, thickens mixture and fills gaps, just as advertised.

### ⭐⭐⭐⭐⭐ great products
*by R***U on December 30, 2025*

west system is great products

### ⭐⭐⭐⭐⭐ Great filler
*by K***A on June 25, 2025*

I use West System products exclusively when doing marine fiberglass repairs/modifications. There are many different filler options, so choose the one that best fits your needs. Mix the resin, add the filler and mix to your desired consistency, then apply. For me, usually similar to mayonnaise works best. Drying time will depend on your choice of hardener and if you've adjusted the resin/hardener ratio.

## Frequently Bought Together

- WEST SYSTEM 404-45 High Density Filler 46oz.
- WEST SYSTEM 105A Epoxy Resin (32 fl oz) Bundle with 205A Fast Epoxy Hardener (7 fl oz) and 300 Mini Pumps Epoxy Metering 3-Pack Pump Set (3 Items)
- West System 406-7 Collodial Silica 5.5oz, off-white

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**Shop now:** [https://www.desertcart.is/products/20049723-west-system-404-high-density-epoxy-filler-strong-structural-thickening](https://www.desertcart.is/products/20049723-west-system-404-high-density-epoxy-filler-strong-structural-thickening)

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*Product available on Desertcart Iceland*
*Store origin: IS*
*Last updated: 2026-03-16*