I recently made homemade marshmallow fondant and had some major problems when I rolled it out. I used a silicone mat and dusted it with corn starch and powdered sugar and it still stuck to the mat. I made it work, but it was just a 6" round cake. I don't know how I would cover a bigger cake. I'm used to using store bought fondant so MMF is pretty new to me. I did kneed in some extra powdered sugar to make it less sticky. Should I have maybe added more? I didn't want...