---
product_id: 5819004
title: "406 Colloidal Silica Epoxy Filler Thickening Additive for WEST SYSTEM Epoxy | Viscosity Control for Strong Structural Bonds | Made in the USA"
brand: "west system"
price: "€ 40.36"
currency: EUR
in_stock: true
category: "West System"
url: https://www.desertcart.sk/products/5819004-406-colloidal-silica-epoxy-filler-thickening-additive-for-west-system
store_origin: SK
region: Slovakia
---

# Boosts strength & abrasion resistance Viscosity control for precision Prevents epoxy runoff on vertical surfaces 406 Colloidal Silica Epoxy Filler Thickening Additive for WEST SYSTEM Epoxy | Viscosity Control for Strong Structural Bonds | Made in the USA

**Brand:** west system
**Price:** € 40.36
**Availability:** ✅ In Stock

## Summary

> 🛠️ Elevate your epoxy game—thicker, stronger, flawless every time!

## Quick Answers

- **What is this?** 406 Colloidal Silica Epoxy Filler Thickening Additive for WEST SYSTEM Epoxy | Viscosity Control for Strong Structural Bonds | Made in the USA by west system
- **How much does it cost?** € 40.36 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/5819004-406-colloidal-silica-epoxy-filler-thickening-additive-for-west-system)

## 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

- • **Creamy Off-White Finish:** Achieve a smooth, stable paste that blends seamlessly into your projects.
- • **Runoff-Resistant Formula:** Say goodbye to sagging—perfect for vertical and overhead repairs.
- • **Precision Viscosity Control:** Master epoxy flow with tailored thickness for flawless application every time.
- • **Enhanced Structural Strength:** Fortify your fairing compounds with superior consistency and durability.
- • **Seamless WEST SYSTEM Compatibility:** Optimized for WEST SYSTEM epoxies without compromising cure or strength.

## Overview

WEST SYSTEM 406 Colloidal Silica is a premium USA-made epoxy thickening additive designed to control viscosity, prevent runoff on challenging surfaces, and enhance the strength and abrasion resistance of fairing compounds. Compatible exclusively with WEST SYSTEM epoxy resins and hardeners, it cures to a stable creamy off-white paste, ensuring superior handling and structural performance for professional-grade repairs and builds.

## Description

West System 406-2 Colloidal Silica 1.7 oz

## Features

- Epoxy thickening additive for viscosity control – WEST SYSTEM 406 Colloidal Silica is a finely powdered Made in the USA additive used to thicken epoxy and control viscosity for improved handling in specific applications.
- Prevents epoxy runoff – Adding this colloidal silica to epoxy resin and hardener mixtures helps prevent runoff on vertical and overhead surfaces, improving material placement without sagging.
- Enhances fairing compound performance – This additive can be used to improve epoxy fairing compounds by increasing strength, consistency, and abrasion resistance where a thicker body is needed.
- Cures to a creamy off-white color – Mixed into epoxy, 406 colloidal silica produces a stable, creamy off-white paste suitable for fairing and other structural tasks.
- Compatible with WEST SYSTEM epoxy systems – Designed for use with WEST SYSTEM epoxy resins and hardeners, this additive helps customize handling without altering the fundamental cure or strength of the base epoxy.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0000AY1OC |
| Best Sellers Rank | #15,541 in Automotive ( See Top 100 in Automotive ) #57 in Care Corrosion & Rust Inhibitors #798 in Oils & Fluids |
| Brand Name | West System |
| Color | white |
| Container Type | container |
| Customer Reviews | 4.8 4.8 out of 5 stars (319) |
| Included Components | urea-resin-adhesives |
| Item Form | Powder |
| Item Package Quantity | 1 |
| Item Type Name | West System 406-2 Colloidal Silica 1.7 oz |
| Manufacturer | Gougeon Brothers, Inc. |
| Material Type | Plastic |
| Model | 406-2 |
| Number of Pieces | 1 |
| Other Special Features of the Product | special_feature |
| Part Number | 406-2 |
| Specific Uses For Product | specific_uses_for_product |
| UPC | 811343011482 |
| Unit Count | 1.0 Ounce |
| Volume | 1.7 Fluid Ounces |
| Warranty Description | Warranty |

## Product Details

- **Brand:** West System
- **Item Form:** Powder
- **Material:** Plastic
- **Special Feature:** special_feature
- **Specific Uses For Product:** specific_uses_for_product

## Images

![406 Colloidal Silica Epoxy Filler Thickening Additive for WEST SYSTEM Epoxy | Viscosity Control for Strong Structural Bonds | Made in the USA - Image 1](https://m.media-amazon.com/images/I/61B9MCaAKPL.jpg)

## Questions & Answers

**Q: Does the resin remain clear after this is added?  (Some of the other filler additives say that they cure red/brown.)**
A: If using west system epoxy 205 or 206 hardener resin is redish or purple.  The filler is white and turns into a tranlucent opaque of color of resin. NO RESIN WILL NOT REMAIN CLEAR.

## Frequently Bought Together

- West System 406-2 Colloidal Silica 1.7 oz
- TotalBoat-14409 Marine Gelcoat for Boat Building, Repair and Composite Coatings (White, Quart with Wax)
- Wax Additive - 4 oz Surfacing Agent for use with Gelcoat and Polyester resins

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.sk/products/5819004-406-colloidal-silica-epoxy-filler-thickening-additive-for-west-system](https://www.desertcart.sk/products/5819004-406-colloidal-silica-epoxy-filler-thickening-additive-for-west-system)

---

*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-06-17*