Custom Crayon mold (help, candy-makers!)

I want to make standard-sized crayons with a mold that has more than one cavity. The only molds I can find are either the wrong size, or only make one at a time, so I decided to look into making my own mold with multiple cavities using the method from this video: http://www.youtube.com/watch?v=47Y8GW3AW7c&feature=related I plan to glue the crayons down, tips up, secure a tube around them, and pour in the rubber cement like they did. The only problem I think I'll have is taking the crayons out of the mold, as it will be very thick, and I won't be able to push them out because of that. Does anyone have experience with large silicone mold-making? If you do, a helpful comment would be greatly appreciated. =)

Thanks.
-Hunting Wabbits