I have made my own MMF in the past and it has been way to soft to hold it shape. I posted about that a few weeks ago. My new quetion is Can I make the MMF and add RTU gumpaste to it to get a better consistency? I guess that would be a 50/50 mix right? Or do I have to use the gumtex in my MMF mixture?
If you are covering a cake with the MMF, I personally wouldn't add GP to it. When I first started making MMF, it was way too soft too. I was really frustrated with it. I would try adding more powdered sugar to firm up your MMF. Are you allowing it to rest overnight? Once you get the hang of it, MMF is so easy and great to work with. Good Luck!
I think you need more sugar. I use MMF all of the time and it looks great! Since MMF doesnt stretch so well I usually get a vinel table cloth and cut it into large squares. Roll it out on one, put another on top to flip it, peel the top one off then put it on the cake and peel off the vinel. It really supports it. Good luck!!!
I'm not using it to cover the cake. I have to make penguins and just wanted to firm up the MMF. I guess I'll just use the RTU stuff ny its self!! TFTH!!
You can use half and half to firm it up to make figures or add tylose powder or gumtex.