I'm a relatively new to the fondant thing, I've taken Wilton Course 3 & 4 but I'm still confused. In course 3 we had to add GumTex to our fondant for our roses. Then, in course 4 we had to either use just plain gum paste or a mix of gum paste and fondant. Why all the differences? What does GumTex really do? I'm so confused. Can't you just stick with one method? Thanks in advance for any light on this subject!

Welcome to Cake Central.
Gumtex can be added to fondant to make it stronger and dry faster. gumtex is used in a recipe to make gumpaste.

A combination of gp and fondant gives you more time to manipulate the dough, but it still dries fairly quickly and more firm.

Which you use will depend on what you are making. Delicate flowers are generall all gumpaste. it can roll thinner and dry faster.

Thanks for the clarification!