Ok, to continue the saga... I made my first MFF and forgot the glycerine. I went back to the completed fondant and kneaded in the glycerine. It has now matured 6 hours, and I decided to look at it to see if it was ok or not. I rolled some out, and lifted it up (pretending I would drape a cake with it). It seems just fine. If it wasn't fine, what would it do? Remember, I never made fondant before.
If it wasn't fine, then there could be any variety of problems when lifting it. It could easily tear, or it could easily stretch and sag. If it tears, it's likely too dry and you'll need to add glycerine, or maybe just shortening to replenish moisture. If it stretches and sags, then it could be too moist and you'll need to add cornstarch to give it more stability.
That's what I was thinking: sagging, tearing, elephant skin, cracks, etc. None of that happened. I may have dodged the bullet here, and this may have worked out! Woo hoo!
I followed the MFF rec. to the T, and mine failed.
I exp. all of the above. It was not fun.
I ended up, staying up all till 3 am making MMF, then i mix the 2 diff types of fondant together, and came out with some really good fondant ( after about 45 min if kneading), it tasted like a Krispy Kream Donut.
A KrispyKreme donut! Now, that's fondant I could sink my teeth into! Glad it worked for you, even if it meant staying up till 3 AM!