--- product_id: 439163740 title: "MEKP Hardener activator for Polyester Resin gelcoat and Topcoat Products (500ml)" brand: "swindon composite supplies" price: "€ 38.67" currency: EUR in_stock: true category: "Swindon Composite Supplies" url: https://www.desertcart.hr/products/439163740-mekp-hardener-activator-for-polyester-resin-gelcoat-and-topcoat-products store_origin: HR region: Croatia --- # 1-3% catalyst ratio Adjustable pot-life & cure speed 500ml treats 25kg resin MEKP Hardener activator for Polyester Resin gelcoat and Topcoat Products (500ml) **Brand:** swindon composite supplies **Price:** € 38.67 **Availability:** ✅ In Stock ## Summary > ⚡ Cure smarter, not harder — unlock flawless polyester resin results every time! ## Quick Answers - **What is this?** MEKP Hardener activator for Polyester Resin gelcoat and Topcoat Products (500ml) by swindon composite supplies - **How much does it cost?** € 38.67 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/439163740-mekp-hardener-activator-for-polyester-resin-gelcoat-and-topcoat-products) ## Best For - swindon composite supplies enthusiasts ## Why This Product - Trusted swindon composite supplies brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Trusted by Pros:** 4.6-star rated by 57 users who demand reliability and consistent curing in every batch. - • **Bulk Ready Formula:** 500ml bottle powers through up to 25kg of polyester resin—perfect for professional projects or serious DIYers. - • **Polyester-Only Power:** Specifically engineered for polyester, gelcoat, and vinylester resins—ensuring optimal compatibility and performance. - • **Safety First Handling:** Corrosive peroxide requires gloves and care—because quality results deserve responsible craftsmanship. - • **Precision Cure Control:** Tailor your resin’s pot-life and cure speed with a flexible 1-3% MEKP ratio for flawless finishes every time. ## Overview MEKP Hardener (500ml) is a high-performance methyl ethyl ketone peroxide catalyst designed exclusively for curing polyester, gelcoat, and vinylester resins. With a precise 1-3% mix ratio, it offers adjustable pot-life and cure speed at ambient temperatures, making it ideal for professional and advanced DIY resin applications. This product is not compatible with epoxy or ISOPON resin systems and requires careful handling due to its corrosive nature. ## Description Product description MEKP Catalyst (Hardener) for Polyester Resin, Gelcoat and Topcoat Using a 2% mix ratio: 100ml hardener will be sufficient for 5KG of resin. 500ml hardener will be sufficient for 25KG of resin. MEKP Catalyst is typically used as a polyester resin catalyst, fibreglass catalyst or vinylester resin systems at a ratio of between 1 and 3%, according to the pot-life and cure speed required and the ambient temperature. Always follow the guidelines that accompany your specific resin system. Legal Disclaimer We have only tested this product on Polyester resin types we sell - We will not be liable for failure when used with a 3rd party product - We are unable to send this product Overseas including Channel Islands ## Features - MEKP - (methyl ethyl ketone peroxide) in phlegmatiser for the curing of unsaturated polyester resins at ambient temperature in combination with cobalt accelerators - MEKP Catalyst is typically used as a polyester resin catalyst, fibreglass catalyst, Gelcoat, Topcoat or vinylester resin systems at a ratio of between 1 and 3%, according to the pot-life and cure speed required and the ambient temperature. Always follow the guidelines that accompany your specific resin system. - IMPORTANT - We cannot guarantee this hardener will work with resins purchased elsewhere so it is critical to do a test beforehand before undertaking a larger project. The hardener is not compatible with ISOPON resin products that use a RED paste type of Hardener. - This MEKP hardener is for POLYESTER resins only - It IS NOT SUITABLE or will work with Epoxy resin systems . - The Hardener is a corrosive peroxide, Handling care and use of gloves Strongly advised. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0B1BFDFWV | | Colour | Clear | | Customer Reviews | 4.6 4.6 out of 5 stars (57) | | Date First Available | 14 May 2022 | | Item Package Quantity | 1 | | Item Weight | 100 g | | Item model number | MEKP-500ml | | Manufacturer | Swindon Composite Supplies | | Material | Resin | | Part Number | MEKP-500 | | Power Source | hand_powered | | Size | 500ml | ## Images ![MEKP Hardener activator for Polyester Resin gelcoat and Topcoat Products (500ml) - Image 1](https://m.media-amazon.com/images/I/51gyk7ICJiL.jpg) ## Available Options This product comes in different **Size** options. --- ## 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.hr/products/439163740-mekp-hardener-activator-for-polyester-resin-gelcoat-and-topcoat-products](https://www.desertcart.hr/products/439163740-mekp-hardener-activator-for-polyester-resin-gelcoat-and-topcoat-products) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-06-23*