Septone Boatcare Fibreglass Polyester Resin – 500ml The resin is used in conjunction with MEKP catalyst at a ratio approximately 1% – 2% catalyst to resin. Ratio will vary depending on ambient temperature, using the lesser ratio in warmer temperatures. Setting time is approximately 20 minutes depending on temperature and amount of catalyst. Caution Avoid contact with skin and eyes. Avoid breathing the vapour or dust produced when sanding.