---
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: "AR$82357"
currency: ARS
in_stock: true
category: "West System"
url: https://www.desertcart.com.ar/products/5819004-406-colloidal-silica-epoxy-filler-thickening-additive-for-west-system
store_origin: AR
region: Argentina
---

# Viscosity control for perfect epoxy thickness Prevents epoxy runoff on vertical & overhead surfaces Proudly made in the USA for trusted quality 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:** AR$82357
**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?** AR$82357 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/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

- • **Runoff Resistance:** Say goodbye to sagging—secure vertical and overhead surfaces with confidence.
- • **Creamy Off-White Finish:** Achieve a smooth, stable paste that blends seamlessly into your projects.
- • **Precision Viscosity Control:** Master epoxy flow with tailored thickness for flawless application every time.
- • **Enhanced Structural Strength:** Boost fairing compound durability and abrasion resistance for long-lasting repairs.
- • **Seamless WEST SYSTEM Compatibility:** Optimized for WEST SYSTEM epoxies without compromising cure time or strength.

## Overview

WEST SYSTEM 406 Colloidal Silica is a premium USA-made epoxy thickening additive designed to control viscosity and prevent runoff on challenging surfaces. It enhances fairing compounds by increasing strength and abrasion resistance while curing to a smooth, creamy off-white paste. Perfectly compatible with WEST SYSTEM epoxy resins and hardeners, it ensures superior handling without altering cure or strength.

## 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 | #16,788 in Automotive ( See Top 100 in Automotive ) #61 in Care Corrosion & Rust Inhibitors #844 in Oils & Fluids |
| Brand Name | West System |
| Color | white |
| Container Type | container |
| Customer Reviews | 4.8 4.8 out of 5 stars (324) |
| 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 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

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

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*Product available on Desertcart Argentina*
*Store origin: AR*
*Last updated: 2026-08-12*