Marshmallow Fondant Won't Harden
Decorating By hmarquis100 Updated 18 Jan 2014 , 12:32am by MBalaska

I started making marshmallow fondant for decorations on my cakes. I thought maybe I wasn't rolling it out thin enough. But it just doesn't harden and dry no matter how long I let it sit out. Any advice?

In my experience, marshmallow fondant never really hardens. You say it's for decorations right? even if you add tylose/cmc it still would not harden. The outside surface would only form a stiff shell but the inside would still be gummy. I suggest using a different type of fondant or use gumpaste, they have lots of tutorials here at CC.

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