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The Winter Catalyst Hardener is specially formulated for use when temperatures fall to around 5°C, ensuring reliable curing of polyester and vinylester resins in cold conditions. Unlike standard catalyst hardeners, this winter-grade MEKP provides a “snap cure”, giving fast and consistent results even in low temperatures.
With a recommended mixing ratio of 1 - 2%, this Winter Catalyst is ideal for fibreglass projects, laminating, mould making, casting and marine repairs carried out during colder months. Its cold-weather formulation helps prevent under-curing, allowing resin applications to maintain strength, durability, and a professional finish.
This catalyst is a clear, colourless liquid with a total active oxygen content of 8.8 - 9.0%, a density of 1.180 g/cm³ at 20°C, and a viscosity of 24 mPa.s at 20°C.
Technical Specifications:
A single MEKP initiator formulation cannot provide optimum results in all resin systems. Evaluation of each MEKP in each resin intended for use is absolutely essential before full-scale manufacturing is attempted.
Code: 27
Customer Reviews5.05 5.0/5 Based on 3 reviews
5 starsReviewed by Onojracing on 08 Dec 2025
I've been using FSL for a while now and the products have always been excellent and very well priced. What is particularly impressive is the speed of delivery and comms - always excellent. Usually items delivered within 2 days, often the next day. Very happy and no reason to look elsewhere. Thanks 5 Stars
FastReviewed by Johnbsproat on 26 Oct 2025
Fast to be delivered, fast to cure the gelcoat
GoodReviewed by P3nnypacker on 25 Mar 2025
Good quality for the price
Fibreglass Supplies use Royal Mail, APC Overnight and the National Hazardous Pallet Network for our Next Day Delivery Services.
Royal Mail
Orders of up to 2kg will usually be sent using a Royal Mail First Class Service for National Next Day Delivery.
APC Overnight
Orders over 2kg and up to 30kg will be sent using a Fully Tracked Next Day Service using APC Overnight. Some smaller Roofing Kits that weigh up to 30kg in Total would be sent on this service. This includes Resins, Gelcoats and Topcoats which are classed as Hazardous and are decanted into 5kg Tins or Pales to comply with the Transportation of Hazardous Goods Act.
Pallet Network
All our larger orders by weight would usually be sent using the National Pallet Network. Non Hazardous Items can be sent using either the Pallet Network or APC Overnight.
All Hazardous goods over 30kg (which includes Roofing Kits over 30kg in total weight) are usually sent using the National Pallet Network on a Fully Trackable Next Day Delivery Service.
Click & Collect
All orders are eligible for Click & Collect. Pick up your items conveniently from our Cattedown Store, available Monday to Friday between 7:30 am and 4:30 pm (excluding Bank Holidays).
NB - Please note that our Direct Control of the Delivery Element extends to making sure we pick pack and dispatch all orders on time. As we have no Direct Control over the performance of any individual courier we would not be responsible for refunds due to the late arrival of any order.
We always work hard with customers to overcome any issues that arise so please call us if you do have any concerns with regard to tight delivery deadlines so that we can provide great advice if needed.
Please read our Returns policy laid out below.
Under the Consumer Contracts Regulations 2014 you are entitled to return goods within 14 days of delivery for a refund of the cost of the goods. The delivery costs and any packaging are not included in the refund. The returned goods should be in the original containers and unopened. It is the customers responsibility to pay for the cost of returning goods to our Business Premises.
Some of our products are made to order and as such once ordered are non refundable and non returnable. These include coloured gelcoats, topcoats and resins.
These Consumer Regulations do not apply to business purchases (B2B). However we will always help in any way and look to find a suitable and mutually acceptable solution should any issues arise through the order process.
It is the customers responsibility to understand the suitability of the product before its use. Technical and Safety Data Sheets are available for all products where applicable. These can be found on most product description pages or if not are available on request. If you are unsure please do not hesitate to contact us for expert advice and product suitability and application.
To organise a return please contact us on the following.