I don't use sugar/flour to roll out my fondant but rather a small amount of Crisco on the board and rolling pin. Makes the fondant a tad shiny and looking gorgeous!
There shouldn't be flour on your fondant in the first place!
Also, rolling out your fondant with powdered sugar will dry out the fondant.
As the PP stated, roll out your fondant using shortening on the board and the rolling pin.
I see in your title you mention wet spots. What did you get on your cake????
When I use dark chocolate fondant, I just brush of as much cornstarch/sugar as I can and then wipe it off with a towel with a bit of shortening. I sometimes just super lightly damp my towel with water (again, very very little).
Quote by @%username% on %date%
%body%