I will be purchasing a deep lace mold and was wondering what everyone liked to use as their medium.
The mold is approx 3" tall and wrap around the entire cake so it is a bit large.

Would fondant be too heavy or soft to use? Would gumpaste get too hard and not allow me to work with it when applying?
Should I mix the two and if so what ratio?

Thanks for any input

When I took a mold making class with James Rosselle (hee, hee, I love saying that ), he recommended fondant (Fondarific, specifically) because it stays pliable long enough to work it and get it on the cake. You should roll it pretty thin, so the weight shouldn't be a problem.

Thanks for the tips. I do have some Fondarific so I will begin working with it.
Have a great day

if i'm doing decorations i do a 50/50 blend of gum paste and fondant. but if you're wrapping the cake, you might want to use fondant so it doesn't set up like gum paste once you've wrapped it.