My daughter is getting ready to decorate a cake for 4H and would like to use piping gel, will it dry, or is there something that can be added to make it dry? She will be decorating a styrofoam dummy with royal icing and piping gel... It will have to look like it did when she made it for several weeks, and possibly a few months if she is chosen as a state fair entry... Thanks for your help 
I still have my stained glass kitty cake from the Great American Cake Show in a box downstairs and it looks the same way it did the day I did it and it's been since the end of April. I used RI for my outlines and then used a brush to put the piping gel on and in some places it's really thick. It doesn't dry hard like RI does but it dries enough that if something touches it, it wont get smeared. My daughter actually knocked the box onto the floor this weekend and the cake (dummy cake) was fine, much to my relief.
I had this question too....I wanted to try the edible butterflies and you cover those in clear piping gel. So do they stay tacky? or dry well enough.
Love ya', Jamie, you always tell it like it is! 
I know this is a really absurdly late reply but I happened to be Googling for something else and found this, so I figured I should let anyone else know who stumbles across it that yes, small, thin amounts of piping gel will eventually dry. It might stay rubbery, so don't expect it to be stiff enough to stand upright on its own, but it will dry.
I brushed some on my Alien mouth in 2010, including pulling a gob downward to make her drool. That whole thing was dry to the touch within a couple of weeks. I just went and poked it, and aside from being dusty, it's still flexible.
I'll try attaching the image but in case that doesn't work, here's a URL for the image:
https://lh6.googleusercontent.com/-1rel77DnALE/TxelIE4OURI/AAAAAAAAAe4/BMHIi6xUwP8/w500-h499-k/cake-2010alienfilmfestival-inthemaking-44.jpg
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