Does anybody know how to make satin ribbon stay on a fondant cake if you are going to use it as a border.

I think you can glue it with a little corn syrup.

i would use a little royal icing to make it stick together, but then it won't soak through the ribbon like bc might

I wait 24hours before attaching the ribbon band. I put a dab or royal icing where the ribbon will overlap and use a pin pushed through the ribbon into the cake to hold it until the icing is dry, then remove the pin.

I just use a little crusting BC. I pipe a small strip, as wide as the ribbon, and then stick one end of the ribbon to that, then, I pipe another strip that's the same width as the ribbon but overlap the strip on the cake and the ribbon so when I bring the end around the end is being held down with both the bc on the cake and the bc on the ribbon. Because the bc is crusting it sets up really quickly!

I use double sided fabric tape found in the sewing section of any craft store. I start wrapping the ribbon, then put the double sided tape on the end that will overlap and tack it back onto the ribbon. It holds perfectly, it's holding the ribbon to the ribbon, the tape does not touch the cake, it leaves no greasy marks and it's easy enough to un-do for the cutting so that they're not mangling the cake trying to get it undone.