--- product_id: 5397946 title: "West System 205-B Fast Epoxy Hardener, 27.5 oz | Fast Cure, Cooler Climates" brand: "west system" price: "$243.82" currency: USD in_stock: true reviews_count: 8 category: "West System" url: https://www.desertcart.ec/products/5397946-west-system-205-b-fast-epoxy-hardener-27-5-oz store_origin: EC region: Ecuador --- # High-strength, moisture-resistant Fast 6-8 hr cure time Cures down to 40°F (4°C) West System 205-B Fast Epoxy Hardener, 27.5 oz | Fast Cure, Cooler Climates **Brand:** west system **Price:** $243.82 **Availability:** ✅ In Stock ## Summary > ⚡ Cure fast, bond strong, and never miss a deadline! ## Quick Answers - **What is this?** West System 205-B Fast Epoxy Hardener, 27.5 oz | Fast Cure, Cooler Climates by west system - **How much does it cost?** $243.82 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/5397946-west-system-205-b-fast-epoxy-hardener-27-5-oz) ## 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 - • **Cold Weather Ready:** Works flawlessly even at chilly 40°F—no project delays. - • **Precision Mix Ratio:** Optimized 5:1 resin-to-hardener for unbeatable bonding. - • **Customizable Formula:** Easily tailored with fillers & pigments for your unique needs. - • **Rapid Room-Temp Cure:** Get solid strength in just hours, not days. - • **Waterproof Durability:** Built to withstand moisture, perfect for marine & outdoor use. ## Overview West System 205-B Fast Hardener is a medium-viscosity epoxy curing agent designed for rapid curing at room temperature and as low as 40°F. When mixed with West System 105 Resin at a 5:1 ratio, it forms a rigid, high-strength, moisture-resistant bond ideal for bonding, coating, and structural repairs. With a pot life of 9-12 minutes and full cure in 1-4 days, it’s perfect for professionals needing fast, reliable results in diverse conditions. ## Description Buy West System 205-B Fast Epoxy Hardener, 27.5 oz | Fast Cure, Cooler Climates | Cure fast and get back to work even in cooler conditions with this reliable, fast-curing epoxy hardener.: Painting Supplies - desertcart.com ✓ FREE DELIVERY possible on eligible purchases Review: West System Products are Great! - West System Products are wonderful for both hobbyists and professionals. Convent package sizes make it easy to buy the right amount without waste. 205-B is great for cold weather or fast cure needs. Review: Know quality,know WestSystem. No quality,no WestSystem. - Can't go wrong with West System. This is the fast hardener, compared to the Slow. Duh. The other pic is of their 404 high-density filler. I use it to make the epoxy thicker. I have dyed it also to make it match the color of wood. Works great! Thanks West System, your a good guy. ## Features - Fast-curing hardener for WEST SYSTEM Epoxy – WEST SYSTEM 205 Fast Hardener is formulated for general coating and bonding applications at lower temperatures and for projects that need a rapid cure at room temperature. - Designed to mix with 105 Epoxy Resin – This hardener is used with WEST SYSTEM 105 Epoxy Resin at a 5:1 mix ratio to create a high-strength, moisture-resistant solid with excellent bonding and barrier coating properties. - Bonds fiberglass, wood, and many metals – The cured 105/205 epoxy system wets out and bonds to wood fiber, fiberglass, reinforcing fabrics, foam, other composite materials, and a variety of metals for marine repair and fabrication work. - Fast working and cure times – At 72°F, the mixed epoxy has a pot life of 9 to 12 minutes, a thin-film working time of 60 to 70 minutes, and cures to a solid state in 6 to 8 hours. - Low-temperature performance with key limitations – 205 Fast Hardener can cure at temperatures as low as 40°F and can be thickened with WEST SYSTEM fillers, but is not intended for clear coating and standard epoxy safety precautions still apply. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0002NY6SW | | Best Sellers Rank | #45,084 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #38 in Boat Painting Supplies | | Brand | West System | | Brand Name | West System | | Color | Clear | | Compatible Material | Fiberglass | | Container Type | Can | | Customer Reviews | 4.8 out of 5 stars 226 Reviews | | Full Cure Time | 4 days | | Global Trade Identification Number | 00811343010577 | | Included Components | Epoxy | | Item Form | Liquid | | Item Package Quantity | 1 | | Item Type Name | Epoxy | | Item Weight | 2.2 pounds | | Manufacturer | WEST SYSTEM | | Material | Epoxy | | Material Type | Epoxy | | Model | 205-B | | Number of Pieces | 1 | | Other Special Features of the Product | Waterproof | | Part Number | 205B | | Special Feature | Waterproof | | Specific Uses For Product | Tile Repair | | UPC | 811343010577 780333707172 799916783816 | | Unit Count | 1 Fluid Ounces | | Viscosity Level | Medium | | Volume | 0.86 quarts | | Water Resistance Level | Waterproof | ## Product Details - **Brand:** West System - **Item Form:** Liquid - **Material:** Epoxy - **Special Feature:** Waterproof - **Specific Uses For Product:** Tile Repair ## Images ![West System 205-B Fast Epoxy Hardener, 27.5 oz | Fast Cure, Cooler Climates - Image 1](https://m.media-amazon.com/images/I/81Cx3Y5mmYL.jpg) ![West System 205-B Fast Epoxy Hardener, 27.5 oz | Fast Cure, Cooler Climates - Image 2](https://m.media-amazon.com/images/I/81ZnL4CXwaL.jpg) ## Questions & Answers **Q: how much hardner do i need for 4.35 gallons?** A: The resin and hardener come as a 5 to 1 ratio. The resisnt exactly a gallon, the hardener in I think a 25 oz can goes with a “gallon” of resin so you would need to get five of these 25 oz cans of hardener and you’ll have 2/3 of a can of hardener left when you’ve used up your 4.35 gallons of resin. **Q: I have used Envirotex Lite to coat tiles and it is crystal clear but SO long to cure. Question is if this is crystal clear? And how long to cure?** A: You have to use 207 hardner and 207 resin. Go to West system site and read about clear finish. **Q: Do these containers come full ? appeared to have channellock marks on lid channel and there was hardener on inner lid. Missing 2 inches of product.** A: It doesn't matter. It was obviously opened by someone. Just return it and get another one or a refund. **Q: My set of resin and hardener came today, but the hardener is brownish/redish in color when I pump it out. Is that correct or should I return it?** A: My hardener was slightly brownish when mixing with the resin, but after mixing it would clear up, and it would harden clear as well. If it is very pronounced, you may have a problem, but if it is just a tint that goes away when you mix, that seems to be normal. You may want to do a test on some scrap material to confirm. ## Customer Reviews ### ⭐⭐⭐⭐⭐ West System Products are Great! *by J***. on November 24, 2025* West System Products are wonderful for both hobbyists and professionals. Convent package sizes make it easy to buy the right amount without waste. 205-B is great for cold weather or fast cure needs. ### ⭐⭐⭐⭐⭐ Know quality,know WestSystem. No quality,no WestSystem. *by K***N on April 1, 2021* Can't go wrong with West System. This is the fast hardener, compared to the Slow. Duh. The other pic is of their 404 high-density filler. I use it to make the epoxy thicker. I have dyed it also to make it match the color of wood. Works great! Thanks West System, your a good guy. ### ⭐⭐⭐⭐⭐ Delivery ahead of schedule *by J***. on June 6, 2024* Timely delivery of product is always desirable. West systems offers among the best performance for an adhesive and structural epoxy. Not to be confused with a slow cure or high depth of pour product. ## Frequently Bought Together - West System 205-B Fast Hardener, Epoxy, Liquid, Epoxy Hardener, Clear - Polycell Multi-Purpose Polyfilla Ready Mixed, 1 Kg --- ## 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.ec/products/5397946-west-system-205-b-fast-epoxy-hardener-27-5-oz](https://www.desertcart.ec/products/5397946-west-system-205-b-fast-epoxy-hardener-27-5-oz) --- *Product available on Desertcart Ecuador* *Store origin: EC* *Last updated: 2026-09-13*