--- product_id: 20049723 title: "WEST System® 404 High-Density Epoxy Filler | Strong Structural Thickening Additive for Epoxy Resin Bonding and Filleting | Made in the USA" brand: "west system" price: "£93.40" currency: GBP in_stock: true category: "West System" url: https://www.desertcart.co.uk/products/20049723-west-system-404-high-density-epoxy-filler-strong-structural-thickening store_origin: GB region: United Kingdom --- # High-density strength boost Gap-filling, non-slumping paste Proudly made in the USA WEST System® 404 High-Density Epoxy Filler | Strong Structural Thickening Additive for Epoxy Resin Bonding and Filleting | Made in the USA **Brand:** west system **Price:** £93.40 **Availability:** ✅ In Stock ## Summary > 🧪 Elevate your epoxy game with strength that sticks and fills like a pro! ## Quick Answers - **What is this?** WEST System® 404 High-Density Epoxy Filler | Strong Structural Thickening Additive for Epoxy Resin Bonding and Filleting | Made in the USA by west system - **How much does it cost?** £93.40 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/20049723-west-system-404-high-density-epoxy-filler-strong-structural-thickening) ## 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 - • **Gap-Filling Powerhouse:** Creates thick, non-slumping mixtures that bridge large gaps without sagging. - • **Maximize Bond Strength:** Enhances epoxy adhesive power for hardware & stud bonding under high cyclic loads. - • **Versatile Compatibility:** Works seamlessly with multiple WEST SYSTEM epoxies for tailored project needs. - • **Precision Viscosity Control:** Adjust thickness from slurry to dense paste by varying filler amount—no air traps. - • **Trusted Marine-Grade Quality:** Formulated by industry leaders since 1969 for structural and marine-grade reliability. ## Overview WEST SYSTEM 404 High-Density Epoxy Filler is a premium, USA-made additive designed to thicken epoxy resin for superior structural bonding and gap filling. Ideal for hardware bonding and filleting, it reduces creep and sagging, ensuring durable, high-strength joints compatible with multiple epoxy systems. Perfect for professionals demanding marine-grade reliability and precision control over epoxy viscosity. ## Description WEST System® 404 High-Density Epoxy Filler | Strong Structural Thickening Additive for Epoxy Resin Bonding and Filleting | Made in the USA: Boating Equipment: desertcart.com: Tools & Home Improvement ## Features - High-density epoxy thickening additive for strength – Made in the USA WEST SYSTEM 404 High-Density Filler is used to maximize epoxy’s adhesive properties in hardware bonding and other applications where high cyclic loads or maximum bond strength are required. - Excellent for hardware and stud bonding – Even small amounts added to epoxy resin and hardener reduce creep in the cured epoxy, making this filler well suited for hardware, fastener, and stud bonding applications. - Creates strong, non-slumping epoxy mixtures – Mixed with epoxy, this filler produces a gap-filling adhesive capable of forming structural fillets or bridging large gaps without sagging, reducing the need for tight joinery. - Compatible with multiple WEST SYSTEM epoxies – 404 High-Density Filler can be blended with WEST SYSTEM 105 resin and 20X hardeners, G/flex 650 epoxy, or G/5 five-minute adhesive and cures to an off-white color. - Viscosity controlled by filler amount – The amount added determines epoxy thickness, from a loose slurry to thicker mixes. For best results, use only enough filler to bridge gaps without trapping air and avoid overfilling the mixing cup. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0006JJAU6 | | Best Sellers Rank | #77,105 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #106 in Wood Filler | | Brand Name | West System | | Color | off-white | | Compatible Material | Wood | | Container Type | Aerosol Can | | Customer Reviews | 4.7 4.7 out of 5 stars (107) | | Included Components | FILLER HIGH-DENSITY 43 OZ | | Item Form | Paste | | Item Package Quantity | 1 | | Item Type Name | West System Filler | | Item Weight | 16 ounces | | Manufacturer | Gougeon Brothers, Inc. | | Material Type | epoxy; filler | | Model | 404-45 | | Other Special Features of the Product | Strong | | Part Number | 404-45 | | Specific Uses For Product | Carpentry, Gap Filling, Hardware Bonding, Repair, Structural Fillets, Woodworking | | UPC | 811343011413 | | Unit Count | 43 Ounce | | Viscosity Level | High | | Volume | 219 ml | | Warranty Description | Limited Warranty | | Water Resistance Level | Water Resistant | ## Product Details - **Brand:** West System - **Item Form:** Paste - **Material:** epoxy; filler - **Special Feature:** Strong - **Specific Uses For Product:** Carpentry, Gap Filling, Hardware Bonding, Repair, Structural Fillets, Woodworking ## Images ![WEST System® 404 High-Density Epoxy Filler | Strong Structural Thickening Additive for Epoxy Resin Bonding and Filleting | Made in the USA - Image 1](https://m.media-amazon.com/images/I/71wtb8ECQOL.jpg) ## Frequently Bought Together - WEST SYSTEM 404-45 High Density Filler 46oz. - WEST SYSTEM 105A Epoxy Resin (32 fl oz) Bundle with 205A Fast Epoxy Hardener (7 fl oz) and 300 Mini Pumps Epoxy Metering 3-Pack Pump Set (3 Items) - West System 406-7 Collodial Silica 5.5oz, off-white --- ## 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.co.uk/products/20049723-west-system-404-high-density-epoxy-filler-strong-structural-thickening](https://www.desertcart.co.uk/products/20049723-west-system-404-high-density-epoxy-filler-strong-structural-thickening) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-08-02*