Same thing here.
I tried to make a bow and finally threw it away...never did dry, I gave it about five days.
Did you have humid weather? I ask because I have used MMF for my last few cakes and I do a lot of fondant work. The pieces I made needed 24 -48 hrs. to dry.
Perhaps too much Crisco? That might keep it from drying out.
edited to add:
perhaps a bit of Gum-tex added to the fondant used for decorations will make it harden better.
Here in Washington State we don't have to worry with the humidity. When I was working with MMF it was drying to quickly!! ![]()
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