--- product_id: 5819004 title: "WEST SYSTEM 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: "₨728" currency: SCR in_stock: true reviews_count: 9 category: "West System" url: https://www.desertcart.sc/products/5819004-west-system-406-colloidal-silica-epoxy-filler-thickening-additive-west store_origin: SC region: Seychelles --- # Viscosity control for perfect epoxy thickness Prevents epoxy runoff on vertical & overhead surfaces Made in the USA with premium quality standards WEST SYSTEM 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:** ₨728 **Availability:** ✅ In Stock ## Summary > 🛠️ Elevate your epoxy game—thicker, stronger, flawless every time! ## Quick Answers - **What is this?** WEST SYSTEM 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?** ₨728 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sc](https://www.desertcart.sc/products/5819004-west-system-406-colloidal-silica-epoxy-filler-thickening-additive-west) ## 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—ideal for vertical and overhead repairs. - • **Creamy Off-White Finish:** Achieve a smooth, stable paste perfect for professional fairing tasks. - • **Precision Viscosity Control:** Master epoxy flow and consistency for flawless application every time. - • **Enhanced Structural Strength:** Boosts fairing compound durability and abrasion resistance. - • **Seamless WEST SYSTEM Compatibility:** Optimized for WEST SYSTEM epoxies without compromising cure or strength. ## Overview WEST SYSTEM 406 Colloidal Silica is a finely powdered additive designed to thicken epoxy resin mixtures, providing superior viscosity control and preventing runoff on challenging surfaces. Made in the USA, 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 products, it ensures professional-grade structural bonds and flawless application for demanding repairs and builds. ## Description West System 406-2 Colloidal Silica 1.7 oz Review: West System awesomeness - I’ve dealt with a couple of epoxy brands over the years and West System’s is by far the best all around system that includes both epoxy and fillers. These fillers are a bit pricy when you factor in the weight or volume but they work just like fillers should. I have yet to encounter any negative issues with these fillers, and they all appear to be packaged in a professional environment. The fillers come bone dry and don’t have any impurities in them. Review: Amazing Product - Used it to add to gelcoat during a crack repair on our boat and it is amazing. ALWAYS USE A RESPIRATOR!!! This is a very fine dust and it will damage your lungs. ## 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 | #11,625 in Automotive ( See Top 100 in Automotive ) #44 in Care Corrosion & Rust Inhibitors #654 in Oils & Fluids | | Brand | West System | | Brand Name | West System | | Color | white | | Container Type | container | | Customer Reviews | 4.8 out of 5 stars 322 Reviews | | 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 | Plastic | | Material Type | Plastic | | Model | 406-2 | | Number of Pieces | 1 | | Other Special Features of the Product | special_feature | | Part Number | 406-2 | | Special Feature | special_feature | | 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 ![WEST SYSTEM 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. ## Customer Reviews ### ⭐⭐⭐⭐⭐ West System awesomeness *by G***Y on February 2, 2024* I’ve dealt with a couple of epoxy brands over the years and West System’s is by far the best all around system that includes both epoxy and fillers. These fillers are a bit pricy when you factor in the weight or volume but they work just like fillers should. I have yet to encounter any negative issues with these fillers, and they all appear to be packaged in a professional environment. The fillers come bone dry and don’t have any impurities in them. ### ⭐⭐⭐⭐⭐ Amazing Product *by N***E on July 15, 2023* Used it to add to gelcoat during a crack repair on our boat and it is amazing. ALWAYS USE A RESPIRATOR!!! This is a very fine dust and it will damage your lungs. ### ⭐⭐⭐⭐⭐ Pricey but well worth it. *by H***M on June 18, 2026* This is the best and easiest product & system I have used so far. ## 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.sc/products/5819004-west-system-406-colloidal-silica-epoxy-filler-thickening-additive-west](https://www.desertcart.sc/products/5819004-west-system-406-colloidal-silica-epoxy-filler-thickening-additive-west) --- *Product available on Desertcart Seychelles* *Store origin: SC* *Last updated: 2026-07-15*