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![Catalyst](https://images.findtheneedle.co.uk/findtheneedle/products/10424130.jpg)
MEKP catalyst to harden polyester resins/gelcoats. Medium speed, which proves to be the most popular and user friendly. Use about 2% by weight up to a maximum of 4%. Overcatalysing can cause excess exothermic reaction and cracking.
For more information on Catalyst talk to Fibrehand Plastering Supplies
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