I haven't made a cake in a few months due to major life changes, surgery, etc. I will be making a 90th birthday cake for my mom the end of January, though, and I want to make the numerals 90 as a cake topper. I've made my own gum paste several times, but since I'm in a place where I'm not doing many cakes, I want to know what I can do with the bulk of the recipe that I make. Can I freeze the gum paste I don't use?
I just used Wilton's gumpaste mix for the first time. The directions say to pretty much use the whole can and add water to it. I only neeeded a golf ball sized amount so I put some of the powder into a custard cup and added enough water to make a thick paste. From there I added a little confectioner's sugar at a time until it came together in a ball. It worked perfectly- rolled great and dried just fine.
Another vote for freezing here. 
You also may want to take this opportunity to make some gumpaste flowers to have on hand for future cakes. They can be stored almost indefinitely in a NON-airtight container with a couple of packs of silica gel and protected from light.
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