4. Pour the soap. Lift the top of the double boiler and carefully pour the soap into the molds. Fill each mold to its rim. Be careful not to let it overflow, or the soap will come out misshapen.
• If the soap is tricky to pour using your double boiler, use a funnel to pour it into a bottle or pitcher with a spout, then transfer the liquid to the soap molds. You'll have to do this quickly, though, so the soap doesn't get too cool before it makes it to the molds.
• If necessary, reheat the soap before you pour it. Heat it back up in the double boiler or place it in the microwave for a few more short bursts of heat to make it easier to pour.