Hey there!
I tried a few times to wrap in plastic, but gave up, I couldn't get it smooth enough! So I just use good old buttercream icing. I scrape off the icing afterwards, and then just wash them with alot of soap and really hot water! Hope I helped! 
Well here's what I do! All I do is brush the sides with some water and then apply the fondant. If your dummies are smooth with no dents or imperfections you should have a smooth finish! When I was preparing for my cake show entry this past March, also my first time using dummies) I called Wilton and spoke with one of their decorators and that is what she suggested to me. That is what they do when making their "cakes" for their yearbooks. She also suggested using an emory board to round the edges! Works like a charm!
Amy
I use styro foam and cover them with fondant and soak them in hot water to remove the fondant the foam doesn't soak up any water and it peels right off. You can use the styro over and over again.
I use my styrofoam dummies over and over! Here is what I do:
Fondant: file the sides with an emery board, spray lightly with water and cover with fondant
RI: just decorate
To reuse: I pop apart the layers and soak in a hot sink with a little bit of Dawn for about an hour and the RI wipes right off - the fondant I just peel away!
I painted my styrofoam dummies with an acrylic paint (not oil-based) and simply smear with Crisco shortening before covering with fondant. End result -- a perfectly smooth and easy to clean (just run under hot water), reuseable cake dummy!! 
why spend more money painting them still smooth without the paint pop it in hot water and wha la clean again, wet and ready for more fondant.
I painted them to last. Unpainted styrofoam dummies have a relatively short life -- they can only be used so often before getting nasty. Besides, hubby is a handyman and he had leftover paint, which worked out well.
Just a note:
I've been using my styrofoam dummies for almost 2 years...and they still look fine. I change the cake styles about every 3 months.
I would only imagine they would get nasty if a butter-based buttercream was used and left on for an extended period of time! I'm not going to add any extra work and paint fumes to myself if I don't have to but thank you for the tip on painting them though!
Amy
CakeMommy wrote:
"If your dummies are smooth with no dents or imperfections...."
Here is an FYI --
There is a product called Foam Finish, which is used to smooth the surface of styrofoam. It can also be used to fill small scratches and dents in the surface of the styrofoam. They sell it at AC Moore, and it costs $$.29 at my local store.
Theresa
Cool! These dummies are expensive to have to buy new ones evertime you get a dent.
I don't have a local shop so I'd have to try and find some online! How come so cheap? This sounds like a great product. If there a special straw to put in the nozzle to help fill just the area needed? I wouldn't want any over spray!
Amy
tmriga wrote:
There is a product called Foam Finish, which is used to smooth the surface of styrofoam. It can also be used to fill small scratches and dents in the surface of the styrofoam. They sell it at AC Moore, and it costs $$.29 at my local store.
Oh thank you!!!!!! You are a godsend! I have quite a few dummies from a local cake store that have slight imperfections.......this will help immensely.
Foam Finish is a paste that can be applied with a spatula.
Here is additional information from the manufacturer's (Beacon Adhesives) website:
BEACON ADHESIVES are available at many independent
retail locations as well as at the following stores:
Hancock Fabrics Ragshop
Michaels A.C. Moore
Jo-Ann Hobby Lobby
Garden Ridge Wal-Mart
Brewers
If you cant find your favorite BEACON glue locally, please contact our distribution center at Signature Crafts 1-800-865-7238. They will be pleased to provide retailers with ordering information.
BEACON ADHESIVES are now available in Canada. For further information, please contact our Canadian distributor,
H.A.Kidd & Co.Ltd., call 416-364-6451, fax 416-364-6451.
Theresa
The soft foam dummies that I use can be re-used very easily. If you use water to attach the fondant, once the fondant is completely dry, just gently pull the soft dummy away from the "shell". If there is a small chunk lost, then just fill it in with buttercream before covering again.
These do not need to be beveled, the corners bevel beautifully when the fondant is applied. Fingermarks are not permanent. If you get a flaw, you can just rub it out.
Even though they are soft, they do not need dowel support for stacked cakes. The foam is very stable.
You can look at my cake pictures and ALL of the show cakes are on this foam. None of them have supports.
I know where you can get these if you're interested.
Michele
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