Especially Wilton gumpaste. Ok so I had to make a figure of a little girl and decided I should give the Wilton gumpaste a try. Followed directions exactly as it said (soooo easy) it was actually soft in texture but apparently once it started to dry, her little face started to crack. 
was upset, so I threw it away and started again. Guess what it happend again, I even tried adding a lillte more shortening but now that it's drying I can see it cracking. Any suggestions, I'm going kooky!
I have never tried the Wilton gumpaste but generally, you knead the gumpaste until it is soft & stretchy ( when you pull it apart in your hands,it stretches like chewie,rather than breaking) before using it ( keep adding shortening to it too, that helps ) - it may take a little while & it should solve the cracking problem ! You could also try mixing a bit of fondant in with it to give you more time before it dries.
Hope that all made sense 
I disagree with the negativity regarding Wilton gumpaste. I use Nick's recipe at home and Wilton's gumpaste when teaching, and while I love that Nick's GP is a little stretchier, Wilton's GP works perfectly well.
The problem you're having is because the gumpaste is doing its job - drying quickly - and you are working too slowly.
Do exactly as Leah said - use a 50/50 mix. Straight gumpaste generally dries too quickly for making figures unless you're really adept at doing it quickly.
I teach classes and I can't tell you how many times my students say "oh my gosh, this is really nice gumpaste. Some of my problems were definately with the paste.... it's so nice to work with a great paste" The paste can make all the difference. I use a modified version of Nick's recipe. If you want it, just e-mail me, I'm happy to share it.
Jen 
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