OK, I've never worked with modeling chocolate, but I found a recipe in a Colette Peters book that looked easier to make than MMF (not that that's real hard, but this was easier) and it said that the modeling chocolate could be used like fondant to cover a cake. SOOOOOOOO.....the recipe said to let it sit overnight (which of course I did not do - who can wait that long?) and when I tried to roll it I made a huge mess. 
SOMEONE PLEASE tell me that they have used modeling chocolate to cover a cake and that I just need to be patient and let it sit.
OR......has anyone had any success with making white chocolate MMF? If so, how much white chocolate did you add?
Thanks in advance to all my fellow cake decorating junkies! 
Well, I guess first it would tell me that I should probably try waiting.....BUT I think I was also asking for other advice from anyone who has actually tried to use it....you know - other tips and stuff. Thanks for all of your help and constructive advice.
If you are using a recipe that includes a simple sugar, it will be a bit on the sticky side and you'll have to use cornstarch to roll it out on. I don't like doing that, so I use only the recipe that is just chocolate and corn syrup.
I work in a chocolate shop as a cake decorator, and we've experimented with different recipes, and I am definitely not a fan of the simple sugar recipe.
Yes, you can cover a cake with modelling chocolate. It's best done on smaller cakes, but if you need to cover a larger cake, mix it half-and-half with fondant to make it more pliable so it doesn't crack when you roll out a big sheet of it and then try to pick it up.
I've used the two-ingredient recipe within a few minutes if I've been desperate, but I suggest waiting a few hours first to let the chocolate rest. I don't feel the need to refrigerate the modelling chocolate because it gets so hard and is difficult to condition - or I should say, more difficult than it needs to be.
Let me know if you have any other questions, I'll be happy to answer them.
Deanna
Modelling chocolate is also called candy clay or chocolate plastic. My recipe is 14 oz. of chocolate and 1/3 cup of light corn syrup. Melt the chocolate in a microwave or double boiler and add the corn syrup to it. It will be a gritty yucky mess at first, but that's okay, because you will knead it once it's rested and it will be like playdough. The chocolate-flavored clay tastes like tootsie rolls, and the white chocolate tastes sort of like candy corn.
If you are having a problem with excessive amounts of oils puddling around the sides of the modelling chocolate as it rests, try slightly warming the corn syrup before adding it to the melted chocolate. Don't overheat it, just warm it up slightly so it's about the same temperature as the chocolate when you combine them. Break off and discard any of the puddled oils once it hardens. Do not try to work it into the chocolate.
You should be fine to cover a cake that size, but in my opinion, anything much bigger than that should have some fondant mixed into it for ease of use. Since this is your first time with modelling chocolate, you might want to do that anyway just to help insure success. I roll my modelling chocolate to about the same thickness as I would plain fondant.
Deanna
Can this be used to make little figures and such like the ones I see made out of fondant. Would you just let it sit to air dry and it will harden? Also I am sure since it is chocolate it is going to be heat sensitive as well??
Thanks
Jennifer
Yes, you can make figures with modelling chocolate. They won't really get hard, so to speak, and they will get droopy in sunlight or hot conditions like any other chocolate product would. Just use common sense. Otherwise, treat it like fondant and go for it.
Deanna
I just tried this recently, and I too, was too impatient to wait! And my two daughters were eager to taste.
But after trying (unsuccessfully) for some time, I decided to leave it, and it did truly become much easier to handle.
I made chocolate roses out of the candy clay, and they looked gorgeous!
The next time, I will take some pictures,
I'm glad to see the rude post has been deleted.
Karen
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