This view shows the interior of the casting. As you can see, it is hollow. I did this to make it easier to remove. The material is fairly runny, so it made it difficult to coat the interior evenly. I rotated the insulator to allow the material to coat the interior. Repeating this process as the material starts to set up helped. Still, there was residual that ran down and filled the bottom of the pinhole solid. This made the bottom part difficult to remove. The upper parts were easy, as the walls of the casting are very flexible. I cut a small hole in the middle of the very bottom to facilitate removal. (This material can tear if pulled on too much.)