I am in the process of decoratnig a wedding cake with butter cream icing, and she wants a satin ribbon around it. I made one tier and the ribbon is showing grease marks...WHAT DO I DO? The cake store near me told me to iron the ribbon between 2 sheets of wax paper, but it hasn't worked!!! HELP!!
One person on here said she puts Press and Seal on the back. I haven't tried it yet, but it sounds good. Good luck!
I've heard of using double stick tape and taping wax paper to the back of the ribbon.
Jacqui
I made a wedding cake with white ribbon on white BC last weekend and I waited until I assembled it at the venue to put the ribbon on all tiers except the bottom. I too was worried about this, but I had let my BC crust well and when I put it on, I did not smush it into the cake. I simply wrapped it tightly enough to be flush and put a small amount of BC in the back to hold it on. It never looked greasy or even wet and stayed put with just the icing at the ends. You can check out the picture in my photos. It was a five tiered cake btw. HTH 
I would cut a piece of Fondant in the same shape of the ribbon and that way the ribbon is touching the fondant and not the buttercream.
Hope that helps.
someone else here said to use saran wrap on the back of the ribbon. I had to do a cake with ribbon before and had the same problem. I just ended up doing a double thickness of ribbon because of the grease coming through.
dmq, someone else said that you can use press-n-seal. You rub it on the back to the ribbon and it will stick to it, which prevents any seeping through from the bc. GOOD LUCK!!!
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