gumpaste will roll much thinner, leaving a more realistic petal for flowers. It also dries faster and harder. It is not always as smooth as fondant, so a nice compromise is to mix the two 50/50. You get strength and smoothness. Only do this if extra thin or extra strong is not needed for whatever you are making.
no, it does not spoil. the sugar content acts as a preservative. It especially won't spoil after its dry. Moisture is a MAJOR contribution to any type of spoilage. you can make decorations months in advance. just store them away from light (fading) and dust (gross). I usually keep things I make in advance in a cake box stored on top of my cupboards so its out of way and my kids can't get to it.
Thanks, carolbby! I spend WAY too much time hanging out here! You'll learn tons that way. Welcome to CC!!
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