They are starting to dry and do start to go hard but then as soon as you put them on buttercream or anything they start to go wet and sticky or if you leave them drying too long they go wet and sticky.
I have found if you put figurines directly on buttercream, they 'melt', go all sticky and floppy as the fondant pulls the moisture from the buttercream or other icing/frosting. The work-around this is to place your shapes on a piece of polystyrene, foam or thick foil-wrapped cardboard so that the fondant bottom doesn't actually touch the icing/frosting.
It could also be that you have very high humidity, in that case, it would be worth making gum paste by adding some Gum Tragacanth/Tylose powder/CMC powder (they all do basically the same thing.) Here are a couple links that explain how to do that. https://www.youtube.com/watch?v=MIc4YC8i6Pc and https://www.youtube.com/watch?v=zZs_HAPOpmM
Also, this is such a cool technique, I'll slip it in here! https://www.youtube.com/watch?v=LOTdwsbgDV8
You want to make sure you use Cornflour/ Cornstarch not powdered/confectioner's sugar when rolling out. Powdered sugar is hygroscopic and will draw moisture to it, especially if you are in a high humidity situation. (Even central heating will do this!)
Trex is white vegetable shortening, in the States it's known as Crisco. It is odourless, flavourless and it is used to make sure your fondant doesn't stick to your surface and it adds moisture to prevent cracking.
I hope that helps! Good luck and let us know, please, if you nail it!
