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What's the resin to catalyst mixing ratio?

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 advise.