I used to make my own MMF. But I read so many posts about people using Fonderific and the other store bought fondants, that I have giving it a try.
The main reason for using the buttercream Fonderific was that I didn't have to use shortening all over my counters. I was told that I would only have to use a little bit of powdered sugar if that even.
I have used this product at my home and my churches, totally different counter tops. I had major sticking problems. I tried the powdered sugar, still stuck. I eventually had to use shortening on the counter top.
First time was in the winter, and then this last week, with the air conditioner, so I don't think it was a humidity, heat, problem.
I am seriously wondering what to do now.
I use Fondarific all the time. I roll it out on my stainless steel table with powder sugar not sure if you would call it "a little" though because I add sugar when I turn the fondant and keep checking it as I roll. I have not had problems with it sticking. Not sure what is causing your problem - it sounds like humidity. My kitchen is kept pretty cold with AC so humidity is not a problem in it.