I am in the US, but I use a cling wrap, any brand will do.
I use stainless steel and I don't cover it. If I am happy to eat off stainless steel every day I am happy to put it in my cakes - after it's cleaned of course.
If I am using wires then I put straws in first that have their ends sealed then fill with either white or dark choc.
Me Me - I am assuming for things like gravity defying cakes and the like.
Threaded rods and copper tubing are also commonly used materials when a strong, bendable structure is required.
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