I made a dummie cake I placed it, inside a store and It is full of ants what can I do or recommend me.... please help meee 
you made need to determine first if they are sugar ants or grease ants and then put out a discreetly placed bait. I have infestations of grease ants periodically. They are, in my case, really tiny black ants. So tiny, they look like black pepper until they move. I put out a couple of capfuls of Amdro the stuff for fire ants. I hide the caps under furniture or similar, so the cats won't get in it. The ants feast for a few hours and then disappear, I am assuming they die. They show up about once a year from outside. This time they were drawn by the cat's greasy hair ball medicines that I left in a basket in the den. Last year they went after the cat food I had in one of the bedrooms when I isolated a new cat.
Can you put a bait under a drape or cloth near the cake? They sell commercial ant traps in grocery and hardware store.
I want to start doing dummy cakes as well and that was one of my concerns. I have since learned of a product called PermaIce - it is a non-edible icing that ices and decorates just like buttercream and is used specifically for dummy cakes.
this certainly sounds like a product to try especially to keep the ants away. i'll have to check it out.
My DH sprays the the floors/molding join about once a month during the summer and about every 6-8 weeks during the rest of the year with some kind of ant killer and it usually keeps them away. You can also put out traps. For a pretty bug-keep-away you can put real marigold plants around something. I plant marigolds in with my vegetable garden and I don't have to spray insecticide on my veggies.
I already sprayed acrylic paint on the cake, I bought It at home depot, I was afraid about putting it on my cake but everything was fine, the fondant is intact, I hope that the ants won´t come back because the cake doesn´t smell like sugar any more 
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