I am making a cross out of fondant to stand on a cake and I want my cross to harden up. Should I mix my fondant with gumpaste or gum tex? How long should it take for my cross to get hard if it's about 1/8 of an inch thick?

Thanks!

Why don't you just make the cross out of straight gumpaste? It will dry much faster

It should take at least a couple days to dry if you add gum tex into it...don't forget to flip it to dry out the other side.

You can make a cross with krispie treats and cover with fondant.

I'd make it out of gumpaste

If you make it out of gumpaste ( which I personally think would be best if you plan on standing it up MHO ) the drying time depends on what kind of gumpaste that you use and the weather. It can take anywhere from overnight to a couple of days. If you're in a hurry try put it on a cookie rack in the oven ( make sure it's off ) and turn on the light with the oven door cracked. HTH!

You can use any one of the following:
gumpaste (alone)
fondant (alone)
about 1/2 & 1/2 gp & fondant
fondant w/GumTex added

With the rain we have been having in the area I suggest either 50/50 or gumpaste.
I suggest it be about 1/4" thick. Allow it to dry 2-3 days.
To get it to stand up stick a toothpick or two in the bottom as it dries.

It mostly depends upoin the humidity in your room.
Straight GP will dry harder but might be harder to cut clean.
Fondant with a lot of tylose will dry in 1-2 days and a food dehydrator makes it fast! Less than one day!