I just use the ribbon plain, but I rub shortening on it before hand and wipe off the excess. If you are applying ribbon to buttercream you will need to do this otherwise the ribbon will get spotty from the fat in the icing. Then just wrap it around. It will stay secure but if you have any worries then you can secure it with a dot of icing. I used corsage pins the first time but then realized this wasn't necessary.
I don't cover cakes in fondant but I imagine it's the same thing. You probably don't have to soak the ribbon but just wrap it and secure with BC or a pin. Just make sure you remove the pins before cutting!!
I use jots from the scrapbooking section in hobby and craft stores. Little tiny circles of double sided sticky tape. They come in different sizes. I use the smallest ones placed right at the edge of the ribbon, wrap ribbon around and then catch the final end right at the edge of the ribbon. Very little overlap and I've never had a problem with a loose ribbon.
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