--- product_id: 5397949 title: "406-7 Collodial Silica 5.5oz, off-white" brand: "west system" price: "281.46 DT" currency: TND in_stock: true reviews_count: 9 category: "West System" url: https://www.desertcart.tn/products/5397949-406-7-collodial-silica-5-5oz-off-white store_origin: TN region: Tunisia --- # Enhances epoxy strength Precise viscosity control Prevents epoxy runoff 406-7 Collodial Silica 5.5oz, off-white **Brand:** west system **Price:** 281.46 DT **Availability:** ✅ In Stock ## Summary > 🧪 Elevate your epoxy game—because your projects deserve precision and power! ## Quick Answers - **What is this?** 406-7 Collodial Silica 5.5oz, off-white by west system - **How much does it cost?** 281.46 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/5397949-406-7-collodial-silica-5-5oz-off-white) ## 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, making your epoxy fairings tougher than ever. - • **Master Your Mix:** Control epoxy thickness with surgical precision for flawless vertical and overhead applications. - • **Stay Put Formula:** Prevents annoying epoxy drips and runoffs, ensuring clean, professional finishes every time. - • **Off-White Elegance:** Cures to a subtle off-white shade, blending seamlessly with fiberglass and marine surfaces. - • **Seamless Consistency:** Transforms your epoxy into a smooth, easy-to-work-with compound that flows just right. ## Overview West System 406-7 Colloidal Silica is a high-viscosity epoxy thickening additive designed to prevent runoff on vertical and overhead surfaces. It enhances the strength, abrasion resistance, and consistency of epoxy fairing compounds, curing to an off-white color. Ideal for professional-grade fiberglass and marine applications, it offers precise viscosity control and water resistance, ensuring durable, clean, and flawless finishes. ## Description Product description WEST SYSTEM Fillers modify the consistency of epoxy, greatly increasing its versatility for a wide array of applications Syrup Consistency (unthickened resin/hardener mixture or "neat" epoxy) CONSISTENCY: Unthickened epoxy, syrup CHARACTERISTICS: Drips off vertical surfaces USES: Coating; wetting out surfaces before bonding; applying fiberglass, graphite, and other reinforcing fabrics Catsup Consistency (slightly thickened) CONSISTENCY: Slightly thickened epoxy, slurry CHARACTERISTICS: Sags down vertical surfaces USES: Laminating or bonding flat panels with large surface areas, injecting into holes with a syringe Mayonnaise Consistency (moderately thickened) CONSISTENCY: Moderately thickened epoxy mixture, creamy CHARACTERISTICS: Clings to vertical surfaces; peaks fall over USES: General bonding, filleting, hardware bonding Peanut Butter Consistency (maximum workable thickness) CONSISTENCY: Maximum thickness epoxy mixture, dense CHARACTERISTICS: Clings to vertical surfaces; peaks stand USES: Gap filling, filleting, fairing, bonding uneven surfaces Versatile, reliable WEST SYSTEM products WEST SYSTEM offers high-quality epoxy resins, hardeners, fillers, and additives. Developed by our in-house chemists, our formulations are proprietary, structural, and marine grade. These epoxies have set the standard for epoxy quality in the marine industry and beyond since 1969. WEST SYSTEM Product Selection Guide How to choose the right WEST SYSTEM Epoxy products for your project 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. Pigments for tinting epoxy 501 White Pigment 501 White Pigment is an epoxy-based liquid colorant used to tint the epoxy mixture white, providing an even, white color base for the final finish system. Cured, pigmented epoxy surfaces are not a final finish surface, but require an additional paint or UV filter coating for ultraviolet protection. Add to the mixed resin/hardener at a rate of approximately one teaspoon of pigment to 8 fl oz of epoxy. More pigments will increase opaqueness and mixture viscosity. One 4 fl oz bottle will tint approximately 1.5 gal of epoxy. Adding a coloring agent to WEST SYSTEM Epoxy is frequently done to make colored castings, highlight an epoxy-coated surface, act as a colored base coat for paint, etc. Without exception, adding pigment will weaken the cured epoxy mixture to some degree. Use very small amounts of pigment, about 5% by weight. As a result, thin films of colored epoxy are somewhat transparent. It usually requires several coats to make the film opaque. 502 Black Pigment 502 Black Pigment is an epoxy-based liquid colorant used to tint the epoxy mixture black, providing an even, black color base for the final finish system. Cured, pigmented epoxy surfaces are not a final finish surface, but require an additional paint or UV filter coating for ultraviolet protection. Add to the mixed resin/hardener at a rate of approximately one teaspoon of pigment to 8 fl oz of epoxy. More pigments will increase opaqueness and mixture viscosity. One 4 fl oz bottle will tint approximately 1.5 gal of epoxy. 503 Gray Pigment 503 Gray Pigment is an epoxy-based liquid colorant used to tint the epoxy mixture gray, providing an even, gray color base for the final finish system. Cured, pigmented epoxy surfaces are not a final finish surface, but require an additional paint or UV filter coating for ultraviolet protection. Add to the mixed resin/hardener at a rate of approximately one teaspoon of pigment to 8 fl oz of epoxy. More pigments will increase opaqueness and mixture viscosity. One 4 fl oz bottle will tint approximately 1.5 gal of epoxy. Additives for modifying epoxy 420 Aluminum Powder 420 Aluminum Powder will increase the hardness and abrasion resistance of the coated surface and improve its moisture resistance. 420 provides limited protection from ultraviolet light in areas that will not be protected with other coatings and can be used as a base for subsequent painting. Cures to a metallic gray color. Add to mixed resin/hardener at the rate of 5%-10% by volume or 1.5 tablespoons per 8 fl oz of epoxy (10 strokes each of resin and hardener from 300 Mini Pumps). 36 oz of 420 will modify up to five gallons of mixed epoxy. 422 Barrier Coat Additive 422 Barrier Coat Additive is a proprietary blend designed to further improve cured epoxy’s moisture exclusion effectiveness. 422 is used as a barrier coating additive to help prevent gelcoat blistering in polyester fiberglass boats. 422 also increases the epoxy’s abrasion resistance. Cures to a light gray color. Add to mixed resin/hardener at the rate of 15 to 20% by volume or 3 tablespoons per 8 fl oz of epoxy. 16 oz can of 422 will modify approximately half a gallon of mixed epoxy. 423 Graphite Powder 423 Graphite Powder is a fine black powder that can be mixed with epoxy to produce a low-friction exterior coating with increased scuff resistance and durability. Epoxy/graphite is commonly used as a low-load, low-speed bearing surface, as a coating on rudders and centerboards, or on the bottoms of racing craft that are dry sailed. It does not provide antifouling qualities. The epoxy/graphite mixture cures to a black color. Add to mixed resin/hardener at the rate of 10% by volume or 1.5 tablespoons per 8 fl oz. of epoxy. 12 oz can of 423 will modify approximately one gallon of epoxy. Review: Great stuff…not easy to work with, BE CAREFUL and go slow!! - 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. Review: Versatile thickener for West Systems epoxy - 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. ## 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 | #51,587 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #76 in Tile Epoxy Adhesives | | Brand | West System | | Brand Name | West System | | Color | off-white | | Compatible Material | Fiberglass | | Container Type | Can | | Customer Reviews | 4.9 out of 5 stars 102 Reviews | | 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 | Colloidal Silica | | 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 | | Special Feature | Controllable viscosity, Prevention of epoxy runoff, Improved strength and consistency of fairing compounds Special Feature Controllable viscosity, Prevention of epoxy runoff, Improved strength and consistency of fairing compounds See more | | UPC | 811343011505 783847056576 | | Unit Count | 5.5 Ounce | | 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 ![406-7 Collodial Silica 5.5oz, off-white - Image 1](https://m.media-amazon.com/images/I/71fv2TtXOvL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great stuff…not easy to work with, BE CAREFUL and go slow!! *by M***L on 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 E***N on 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. ### ⭐⭐⭐⭐⭐ Good quality product *by M***E on May 11, 2026* Worked exactly as expected and mixed well for my project. Reliable product and easy to use. ## 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.tn/products/5397949-406-7-collodial-silica-5-5oz-off-white](https://www.desertcart.tn/products/5397949-406-7-collodial-silica-5-5oz-off-white) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-06-10*