Can color flow be placed directly on the cake. For example if I were to make a pattern on wax paper with piping gel and lay it out on my cake could I use color flow on the cake? I see where some say there is a waiting period for color flow. Just not sure and I am hoping someone on here can help. I see lots of cakes on here using color flow. I have a few cakes to do in a few weeks and would like to give this a try.