You may wish to lightly coat the interior of your mold with silicone spray or cooking spray to aid in removal of the finished shell. After spraying, wipe out any excess with a paper towel, leaving only a light film to coat the interior of the mold.

With the temperature of your wax at 185-190 degrees F, fill your mold.

I always fill my molds to a point that is no higher than about half an inch below the top of the mold. The half-inch clearance helps minimize the possibility of spills if you later have to move the mold, such as to a water bath.