--- product_id: 20049723 title: "404 High-Density Epoxy Filler | Strong Structural Thickening Additive for Epoxy Resin Bonding and Filleting | Made in The USA" brand: "west system" price: "NT$4403" currency: TWD in_stock: true reviews_count: 9 category: "West System" url: https://www.desertcart.tw/products/20049723-404-high-density-epoxy-filler-strong-structural-thickening-additive-epoxy store_origin: TW region: Taiwan --- # Gap-filling, non-slumping paste High-density strength boost Proudly made in the USA 404 High-Density Epoxy Filler | Strong Structural Thickening Additive for Epoxy Resin Bonding and Filleting | Made in The USA **Brand:** west system **Price:** NT$4403 **Availability:** ✅ In Stock ## Summary > 🧱 Build stronger bonds that won’t quit — fill gaps like a pro! ## Quick Answers - **What is this?** 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?** NT$4403 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/20049723-404-high-density-epoxy-filler-strong-structural-thickening-additive-epoxy) ## 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 - • **Customizable Viscosity:** Adjust filler amount to control epoxy thickness from slurry to paste. - • **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 WEST SYSTEM 105 resin, 20X hardeners, G/flex 650, and G/5 adhesives. - • **Water-Resistant Durability:** Delivers strong, long-lasting bonds ideal for carpentry, repairs, and structural fillets. ## Overview WEST System® 404 High-Density Epoxy Filler is a premium, USA-made thickening additive designed to maximize epoxy strength and durability. Perfect for hardware bonding and structural filleting, it creates gap-filling, non-slumping epoxy mixtures with adjustable viscosity. Compatible with multiple WEST SYSTEM epoxies, it ensures water-resistant, high-performance bonds for woodworking, repairs, and demanding applications. ## 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 Review: Epoxy filler - Nice addition to west epoxy, thickens mixture and fills gaps, just as advertised. Review: great products - west system is great products ## 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 | #147,183 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #174 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 (106) | | Included Components | FILLER HIGH-DENSITY 43 OZ | | Item Form | Paste | | Item Package Quantity | 1 | | Item Type Name | West System Filler | | Item Weight | 3.3 Pounds | | Manufacturer | Gougeon Brothers, Inc. | | Material Type | epoxy; filler | | Model | 404-45 | | Other Special Features of the Product | Strong | | Specific Uses For Product | Carpentry, Gap Filling, Hardware Bonding, Repair, Structural Fillets, Woodworking | | UPC | 811343011413 | | Unit Count | 43.0 Ounce | | Viscosity | Adjustable by adding filler | | 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 ![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) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Epoxy filler *by B***I on December 9, 2023* Nice addition to west epoxy, thickens mixture and fills gaps, just as advertised. ### ⭐⭐⭐⭐⭐ great products *by R***U on December 30, 2025* west system is great products ### ⭐⭐⭐⭐⭐ Great filler *by K***A on June 25, 2025* I use West System products exclusively when doing marine fiberglass repairs/modifications. There are many different filler options, so choose the one that best fits your needs. Mix the resin, add the filler and mix to your desired consistency, then apply. For me, usually similar to mayonnaise works best. Drying time will depend on your choice of hardener and if you've adjusted the resin/hardener ratio. ## 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.tw/products/20049723-404-high-density-epoxy-filler-strong-structural-thickening-additive-epoxy](https://www.desertcart.tw/products/20049723-404-high-density-epoxy-filler-strong-structural-thickening-additive-epoxy) --- *Product available on Desertcart Taiwan* *Store origin: TW* *Last updated: 2026-04-22*