I use water for the boards and lay the fondant on top. And then let it dry.
I hate to waste an enter piece of fondant for just the board rim, so after my cake is iced and before I put on the bottom border, I run a piece of fondant through my pasta machine and cut it the needed width. I sprinkle generously with PS and roll up. I spread a thin coat of butter cream on the board and roll the fondant strip out slowly going around the board. Trim excess, put on bottom border then glue on a ribbon wrap.
I do what Debbie does: just add the fondant after the cake to not waste fondant under the cake.
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