Do you want to make the model as if the packaging or the way to paint your own understanding, then you do that best by modeling paint.
Email is a synthetic paint and can be diluted with Revell Color Mix. Email Color is after 4 to 6 hours in dry and then it can be started with the overcoated.
Want to use Email Color Airbrush in a set? No problem! With Email Color should be used than 3 parts paint to 2 parts Color Mix. The handy pipettes lets you control these quantities accurately.