AFrom your question I'm going to assume you have no experience with fondant (correct me if I'm wrong)
SOME commercially made fondants have a nasty taste, it is for this reason that a lot of people tend to make their own homemade fondant.
If you are a beginning decorator I would suggest you just use the Wilton fondant for this project. The people you are serving the cake to will be able to peel off the fondant if they don't like the taste. And you will be able to get your design.
AI use white modelling chocolate to cover my skull cakes, instead of fondant. It tastes great, is roughly the right colour and texture for a skull (you can add edible dusts to make it even more realistic) and also it will enable you to cover it in separate pieces and then blend easily and seemlessly together - especially in the eye sockets which are the tricky part. The only downside is the cost (if you don't make your own).
AI think if you don't have any experience with fondant it's not really a good idea to try and make it. If this cake is just for you then sure go ahead and try it.
Beginners often get into trouble by taking on much more than they are ready for. I think it's important to keep it simple
AThat's why I suggested modelling chocolate. It's a lot more forgiving than fondant. I've been covering cakes with fondant for 20+ years, and I would say I still find modelling chocolate easier to work with, especially when covering awkward shapes.
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