Air cures no baking. Working time depends on the temperature of the room you are working in while using magic sculp. Most often you should have a couple of hours or more working time. I have worked with it longer in the winter and shorter in the summer. So there is really no real set time period.
Shelf life- NEW IMPROVED FORMULA, Non Crystallizing Resin. Stays Soft and ready to use. Should last a life time.