I made 4 very large fondant/gumpaste/cmc walls which are 1/4" thick x 12" x 18" on Wednesday and laid each one on a foam core board to dry. I have turned them over each day and even tried putting them on cooling racks and they aren't drying out. They are firm, not floppy, but there is no way that these walls are going to stand on their own being connected at just the corners.

I can't out them in the oven with just the oven light on because the light in my oven doesn't work. I am afraid to heat up the oven and put the pieces in it like some people have suggested in past posts.

These pieces are soooo big that it will cost me a fortune to go buy all new gumpaste to start over. These have to dry by next Sunday so I can pack them in my suitcase to fly them to another state to make a cake for a family member.

All help will be greatly appreciated

I took each piece and put it one a cooling rack and stacked them all up on stackable cooling racks in front of a fan. Will see what that does.

how thick are the pieces? It may just need more drying time. What kind of gumpaste are you using?

They are 1/4". I used Wilton gumpaste, Wilton fondant and lots of cmc kneaded in.

You might try coating the backs of them with melted almond bark or candy melts. When it cools, they'll be firm enough to stand.

I put mine in the oven with just the oven light on, it helps speed up the drying.

Is it humid there? If so, do you have the AC on or a dehumidifier?

Yes, it has been humid up until last night, and the a/c's have been running (we have 4 of them around the house) until this morning when the temps dropped to a wonderful 65 degrees. I put the pieces on top of a cabinet where the a/c would blow directly on them and nothing except they felt a little more moist.

They just need more drying time. Keep turning them over 2-3 X a day. Be careful to have them too close to A/C unit. A dehumidifier may also help.
On assembly consider using styrofoam rectangles/squares at bottom corners (hidden on the inside of walls) as it will help keep them stable.
Good luck!

[/quote]Great idea about the styrofoam pieces, I hadn't thought about that
Thanks![/quote]

You are welcome ptanyer!
I did that once on a similar large structure and the styrofoam saved it!

After putting the pieces on cooling racks and placing them in front of a fan all day, the pieces are firming up. By the end of the week they should be just right. Thanks to everyone for all their help