Work out how much Glass you have by weight and multiply by 2.5. i.e. for 2kg of fibreglass mat, you will require 5kg of resin. Alternatively, use our Materials Quantity Calculator. Roofing applications may require more resin if the resin is applied to OSB3 boards as the boards will soak more resin. Our materials calculator will give exact requirements depending on application e.g. Roofing, Pond Lining or General Fibreglass Projects.

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Yes, all Resins, Topcoats and Gelcoats sold by FibreGlassDirect are supplied with sufficient catalyst. 

Unfortunately, Polyester Resin cannot be used on Polystyrene as it will eat into it! An Epoxy Resin would be better suited for this application.

This depends on the temperature of your working conditions and how much catalyst has been incorporated into the mix. Warmer temperatures will reduce your curing time and colder temperatures will increase the length of cure.  Likewise, adding extra catalyst will speed up the curing process - often necessary for colder temperatures and reducing catalyst will reduce curing - again often necessary during warmer temperatures. We would recommend mixing no more than 1.5 - 2kg at a time. Once the resin and catalyst are mixed, the curing process will begin and you are working against the clock to get the resin applied - usually no more than 20 minutes. Only mix as much as you need.  Epoxy Resin is mixed on a ratio basis and should not be altered. Room temperature is the ideal scenario for curing. Each resin type will differ so we would always recommend referring to the MSDS and TDS available on each product listing before use.  Although some resins may be hard to the touch after 24 hours, some may not be fully cured for up to 3 days. Again, this information will be available on the product Technical Data Sheet... Read more

Generally speaking, for Polyester Resins, the mixing ratio is 2% i.e. 20ml for every 1kg of Resin in working conditions at room temperature. For the Water Clear Casting Polyester Resin, this drops to 1.5% or 15ml for every 1kg. In colder working temperatures you may wish to increase the catalyst addition to 3% but definitely, no more than 4% to speed up the curing process. Similarly, in warmer temperatures, you may wish to reduce the amount of catalyst to extend the pot life of your resin. In this case, you should not go below 1%.  To ensure accuracy, please refer to the TDS of each resin which will detail cure times.  Epoxy resins are treated very differently and work on a ratio e.g. 1:1. Please refer to the TDS and MSDS attachments which are available on each product page as each Epoxy Resin will vary. If in doubt, don't hesitate to contact our team who would be happy to... Read more