Check the impression on the teeth you will be making fangs on. Not everyone gets a good impression first try. Place the impression still in the tray in a bowl of water to keep it fresh. Do not wait to make your plaster positive. Alginate will start to shrink in about an hour, so your positive needs to be made right away. Also, if there is part of the plastic tray showing thru in the middle (not rims) brush a little petroleum jelly there so the plastic won't stick to the Labstone you'll be making in your next step.
