I am adding Gum Tex to fondant in order to make bow decorations for cupcake toppers. How long should I let the fondant sit after I've added the Gum Tex before I attempt to start making the bows? 
It'll work best if you knead it in, wrap it well, and let it sit at least overnight.
Rae
I've added gumtex to fondant and have used it right away many of times.
I've added gumtex to fondant and have used it right away many of times.
I do that too, but mainly for figures or objects.
When I want to roll it thinner and have it hold it's shape without stretching, I just find that it acts better if it's cured for awhile--the OP is asking about a bow.
Rae
Maybe it's my kitchen, but for me it actually works better to use it right away, even with bows. Most of my bows are fondant/gum-tex that was mixed and used right away.
I honestly just go by feel. So I'd be no help there. 
Yes it does.
Honestly though, I'm not sure how it compares price wise.
Quote by @%username% on %date%
%body%