How To: Make resin jewelry

Thanx for the tutorial! I was just wondering if when you go to do the second layer (the dome layer) if you use the same epoxy from the first layer? How long does it last? or do you always have to make a new batch?

I've found that if put the excess in the freezer, that it will last for awhile. After removing, let it set at room temperature to thin, or place it in the microwave for a few seconds. They do sell dome shaping resin epoxy (which is more expensive than regular resin epoxy, but I'm not sure if that is what he used).