Measure and dispense VytaFle™ 40 mold rubber. Mix thoroughly for three minutes, making sure to scrape the bottom and sides of the container. Pour VytaFlex™ 40 mold rubber over the model and existing rubber to create the second half of mold. Let VytaFlex™ 40 mold rubber cure for 16 hrs. at room temperature (72°F / 23°C).