There's a trick to that....it is a little smudgy from the shortening, so I spray the inside of the ball with Pam (not shortening) once I deflate the balloon, just a little bit and it shines it up. Other products might work too, but since the gelatin is sensitive to water this is what I have tried so far.
For trimming the bottom, I don't wait until the ball is dry, I wait until it's set up and easily handled (could be an hour or two) but still a little flexible, then I can easily trim with scissors, being VERY careful not to pop the balloon. You will find a large balloon is very heavy and hard to handle when making the snow globes.
