

Yes, one can make them in a freezer. Basically, you add a piece of styrofoam underneath your Wintercraft Freezing Base. This simulates the insulating qualities of the earth nor snow allowing the bottom to stay open. We've had some cirucular styrofoam insulating disks made that can be purchased to help aid in this process.
To address how long to freezer them. Freezers do run at different temps, but for a small globe I find about 18 hours in my freezer works well for a nice thick result. You may need to vary the time based on the size and your particular freezer temp.
We also offer a Four Season Kit that includes a styro base and more tips.