I made two batches of MMF.. One is perfect and the other is messed up.. The bad one won't come all the way together when I need it. Instead, it cracks and has holes like dry clay. I tried adding more marshmallows, more shortening and even some corn syrup that was a tip in another post. If I microwave it, it becomes soft and pliable, but as soon as it starts to cool down, it cracks and feels sandy. Please help.. TIA

More shortening.[/u]

I agree with sweettreat. Your fondant is to dry. To add moisture knead in some shortening.

What about adding a tsp or so of water then microwave and knead? I've had that happen before and had great success just adding some water. Good luck!

I have added so much shortening, that I was starting to worry that was the problem. It is a bright yellow fondant, so I am wondering if the color messed it up.. I will try some water and more shortening. Thanks.

Oh yes, color can do that.

I ended up just throwing the fondant away.. I added so much shortening that every time I kneaded it, shortening would squish out, yet it still had holes. It was disgusting. Made a new batch with less color and worked great. Made the cake without too many hiccups. If you are looking, it is the Sponge Bob cake.