fondant usually takes a while to dry, like over 24 hours depending on the humidity level. But just to clairify, what do you want to dry the fonadant or the "paint" you put on it? I guess it would help if you told us what the shapes are and how you want to use them, as they may not need to be dry to do what you want.
I've popped my stuff in a cold oven with the light on and that has dried things surprisingly quickly. also, mixing some tylose, or gum tracacanth, (1 tsp per lb of fondant) will make it dry faster. Also a 50/50 mix of fondant and gumpaste will dry faster. I know that won't help you now, but for future reference
Just a word of warning on the dehydrators. Pay attention to see if it is a heated dehydrator and, if so, if you can turn the heat off or down. I have one that has a heater and it melts fondant. It does not have a non-heated option, so I'm going to have to perform surgery and disconnect the heating element entirely.
This is a really great idea and I know sugarshack (who makes the most fabulous cakes) uses a dehydrator, so it does work. Just make sure you're getting one that lets you turn the heat down!
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i place my items in a dehydrator on the lowest heat setting and it works great. I made bow loops the day b4 i needed then for the cake and placed them in the dehydrator and they nice and hard for the next morning
I have cute 15 2" x6" strips and painted them brown. They are not too thick either. The paint and the fondant seem to dry at about the same rate. I made them last night and they need to be attached to a cake tomorrow afternoon (late). I just need them to be very dry when I do this so that they will stand up and hold their shape.