One can certainly make dummy cakes using b'cream. As someone said, it eventually will crust over but never totally dry hard. If you look in my gallery I have many b'cream cakes - some of them dummy cakes that I did over the yrs as I prefered to work in mainly b'cream.
Use a recipe that has low fat and high sugar content. The less fat the more it will curst. Wilton's class b'cream recipe is good for what you want to do. Stay away from creamy recipes as they won't dry up enough.
If you have any more ?s please p.m. me but I'm only on the computer a couple hr a day so it might take me awhile to get back to you.
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