--- product_id: 5397949 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: "51070CFA" currency: XOF in_stock: true reviews_count: 9 url: https://www.desertcart.sn/products/5397949-406-colloidal-silica-epoxy-filler-thickening-additive-for-west-system store_origin: SN region: Senegal --- # Precision viscosity control Prevents epoxy runoff on vertical/overhead surfaces Enhances epoxy strength & abrasion resistance 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:** 51070CFA **Availability:** ✅ In Stock ## Summary > 🛠️ Elevate your epoxy game—because your projects deserve precision and power! ## 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?** 51070CFA with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/products/5397949-406-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 - • **Built to Last:** Boosts strength and abrasion resistance for durable, professional-grade repairs 🛠️ - • **Master Your Mix:** Achieve flawless epoxy consistency with precise viscosity control ⚖️ - • **Stay Put, No Drip:** Formulated to prevent epoxy runoff even on challenging vertical and overhead joints ⬆️ - • **Off-White Elegance:** Cures to a clean off-white finish, perfect for subtle, high-end marine and industrial applications - • **Seamless Integration:** Compatible with all WEST SYSTEM epoxies and fillers for tailored performance ## Overview West System 406-7 Colloidal Silica is a high-viscosity epoxy additive designed to control flow and improve the strength and abrasion resistance of epoxy fairing compounds. Ideal for vertical and overhead applications, it prevents runoff and cures to an off-white color, ensuring professional, durable finishes compatible with all WEST SYSTEM epoxy products. ## Description 1. Start with 105 Epoxy Resin, the basic ingredient of all WEST SYSTEM Epoxy compounds. Use 300 Mini Pumps for convenient and accurate metering. 2. Mix with one of four WEST SYSTEM hardeners. Select a hardener for its intended use and for the cure speed best suited for your job in the temperature range in which you are working. 3. Add one of six WEST SYSTEM fillers to thicken the mixture as needed. Select a filler for its handling characteristics or cured physical properties. Or, add WEST SYSTEM additives to provide specific coating properties. WEST SYSTEM pigments can be used to change the epoxy's color. ## Features - 406 Colloidal Silica is an epoxy thickening additive used to control the viscosity of the epoxy. - Prevents epoxy runoff in vertical and overhead joints. - Can be used to improve strength, abrasion resistance, and consistency of epoxy fairing compounds. - Cures to an off-white color. ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B005150RUW | | Best Sellers Rank | #68,057 in Industrial & Scientific (See Top 100 in Industrial & Scientific) #91 in Tile Epoxy Adhesives | | Brand Name | West System | | Color | off-white | | Compatible Material | Fiberglass | | Container Type | Can | | Customer Reviews | 5.0 5.0 out of 5 stars (106) 5.0 out of 5 stars | | Full Cure Time | 24 hours | | Global Trade Identification Number | 00811343011505 | | Included Components | FILLER COLLOIDAL SILICA 5.5 OZ | | Item Form | Liquid | | Item Package Quantity | 1 | | Item Type Name | MARINE ACCESSORIES | | Item Weight | 5.5 ounces | | Manufacturer | WEST SYSTEM | | Material Type | Colloidal Silica | | Model | 406-7 | | Number Of Pieces | 1 | | Other Special Features Of The Product | Controllable viscosity, Prevention of epoxy runoff, Improved strength and consistency of fairing compounds | | Part Number | 406-7 | | Unit Count | 5.5 Ounce | | Upc | 811343011505 783847056576 | | Viscosity Level | High | | Volume | 5.5 fluid ounces | | Warranty Description | Limited Warranty | | Water Resistance Level | Water Resistant | ## Product Details - **Brand:** West System - **Color:** off-white - **Item Form:** Liquid - **Material:** Colloidal Silica ## 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/71fv2TtXOvL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good quality product *by on Reviewed in the United States May 11, 2026* Worked exactly as expected and mixed well for my project. Reliable product and easy to use. ### ⭐⭐⭐⭐⭐ Great stuff…not easy to work with, BE CAREFUL and go slow!! *by on Reviewed in the United States May 1, 2023* This stuff works great!! It’s not easy to mix into the epoxy, it’s so insanely light, it just floats away if you’re not very very careful!! Add a little at a time, mix inside a garage or somewhere the wind can’t get to the mixing bowl. Once it’s mixed in, it does a great job thickening up the epoxy. Great for vertical surfaces as it really holds upright well once mixed to the proper thickness. ### ⭐⭐⭐⭐⭐ Versatile thickener for West Systems epoxy *by on Reviewed in the United States April 18, 2026* I’ve used West Systems for probably 50 years. After the initial learning curve, it’s hard to use anything else. I use 406 on a majority of my glue joints. Measure it out into cut-down McDonalds cups using a gram scale for as little as 6 grams or for how many grams your container can hold.It makes a self-filling, durable joint in so many applications. Add as much 406 to epoxy for the thickness you need to make super strong joints. ## Frequently Bought Together - West System 406-7 Collodial Silica 5.5oz, off-white - West System 105 Epoxy Resin (.98Gallon 10.3-Pounds) --- ## 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.sn/products/5397949-406-colloidal-silica-epoxy-filler-thickening-additive-for-west-system](https://www.desertcart.sn/products/5397949-406-colloidal-silica-epoxy-filler-thickening-additive-for-west-system) --- *Product available on Desertcart Senegal* *Store origin: SN* *Last updated: 2026-08-29*