I am flying home to Canada from San Diego, and the weight of my cake stuff is going to KILL me.. can I use Petal Dust to color gympaste/and fondant, or should I use gel colors?

I am taking the petal dust for "extra color" but can I use it for a base color?

Do I just mix it in? Do I need to add more Crisco?

Help and Tips would be great!

Taylor