Hi Babes – I use homemade marshmallow fondant and have never had problems with cracking unless pressure is applied to a piece that has dried. If left alone after getting the shape I want, I have never had cracking. It might take a bit longer to dry than 50/50 but I find it a lot more forgiving and not really that much longer to dry. It often only needs 30 mins to an hour to get stiff enough to keep its shape after applying to a cake or if making pieces that I want to keep a flat look. Or 24 hrs for things like bow loops for loopy bow toppers that need to carry a bit of weight (i.e. from other bow loops) or torso pieces of figures. If you don`t want to make your own, then I`d try using straight fondant vs. mixing in gumpaste unless you want or need to make something very thin.
HTH – Violet
Violet - The Violet Cake Shop™ - http://www.facebook.com/TheVioletCakeShop
