{"product_id":"west-system-406-colloidal-silica-filler-10-lb","title":"West System 406 Colloidal Silica Filler – 10 lb","description":"\u003ch2\u003eHigh-Strength Thickening Filler for Epoxy Systems\u003c\/h2\u003e\u003cp\u003eColloidal Silica (406) is a fine, fumed silica powder that thickens epoxy to control flow and prevent sag on vertical and overhead surfaces. At 10 lbs, this bulk container is well-suited for boatbuilding, structural repairs, and any project requiring consistent, high-volume filleting or bonding work.\u003c\/p\u003e\u003cp\u003eWhen blended into epoxy resin and hardener, it produces a smooth, gap-filling mixture that bonds tenaciously to wood, fiberglass, and most marine substrates. It cures to an off-white colour and can be painted, faired, or finished once fully cured.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eControls epoxy viscosity — prevents runoff on vertical and overhead joints\u003c\/li\u003e\n\u003cli\u003eCreates a strong, smooth mixture ideal for structural bonding and filleting\u003c\/li\u003e\n\u003cli\u003eMost versatile filler in the 400-series lineup — works across a wide range of applications\u003c\/li\u003e\n\u003cli\u003eFrequently combined with other fillers to improve fairing compound strength and abrasion resistance\u003c\/li\u003e\n\u003cli\u003eCures to an off-white colour; paintable and sandable\u003c\/li\u003e\n\u003cli\u003e10 lb bulk container — suited for large-scale or ongoing projects\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCommon Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eStructural fillets along bulkheads, frames, and hull-to-deck joints\u003c\/li\u003e\n\u003cli\u003eGap-filling bonds on wood and fiberglass assemblies\u003c\/li\u003e\n\u003cli\u003eThickening base for custom fairing compounds when blended with low-density fillers\u003c\/li\u003e\n\u003cli\u003eOverhead and vertical epoxy work where sag control is critical\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eRecommended Pairings\u003c\/h3\u003e\u003cp\u003eUse with \u003ca href=\"\/products\/west-system-c105a-epoxy-resin-946-ml-32-oz\"\u003eWest System C105A Epoxy Resin\u003c\/a\u003e and a compatible hardener. For large surface areas or warm-weather work, pair with the \u003ca href=\"\/products\/west-system-c209sb-extra-slow-hardener-1-24-l-42-2oz\"\u003eWest System C209SB Extra Slow Hardener\u003c\/a\u003e for extended working time. For lighter fairing work, consider blending with \u003ca href=\"\/products\/west-system-407-low-density-filler-14-lb\"\u003eWest System 407 Low Density Filler\u003c\/a\u003e to reduce weight and improve sandability.\u003c\/p\u003e\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eBest Use Case:\u003c\/strong\u003e 406 Colloidal Silica is the right call for customers doing structural bonding, filleting, or any epoxy work on vertical or overhead surfaces where runoff is a concern. It's the most versatile filler in the lineup — recommend it as a starting point for customers who aren't sure which filler to use. For customers building fillets along bulkheads or frames, suggest mixing to a peanut butter consistency. When a customer needs a fairing compound, suggest blending 406 with 407 Low Density Filler for a lighter, easier-to-sand result. The 10 lb size is best for boatbuilders or yards doing ongoing work — for smaller one-off repairs, a smaller size may be more appropriate if available.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51233005240356,"sku":"655-406B","price":486.89,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/655-4067_4a9b357d-ff93-4c14-9c9a-8f059a10742e.jpg?v=1786152035","url":"https:\/\/marisolmarine.com\/products\/west-system-406-colloidal-silica-filler-10-lb","provider":"Marisol Marine Company","version":"1.0","type":"link"}