If desired, you can remove air bubbles before combining TotalBoat Cast N Turn Part A and Part B components. To do this, measure each component in a separate cup at the specified 1 to 1 mix ratio by volume, then put the cups in a vacuum chamber. After you remove the components from the vacuum chamber and combine them, pour them into a prepared mold and place the mold in a pressure pot to cure. Curing in a pressure pot also helps to ensure a 100% bubble-free casting.