The General Purpose Metox Catalyst is a catalyst that helps to mix resins and gelcoats thoroughly. It is important to add the correct amount of catalyst to ensure the best results. 1% is considered a slow mix, 2% is ideal, 3% is a fast mix. Additions outside these bands are not recommended for proper curing. The addition of more than 4% may result in a failure to cure. The pot life of these mixes is also determined by temperature. The higher the temperature the faster the cure. As a general guide 2% addition at 20ºC gives 15-20 minutes pot life. The resin cures quicker if left in a large quantity such as in the mixing bucket or in castings.