I tried my first buttercream transfer last night, and it didnt turn out so well. Everything was fine until I tried to remove the wax paper...

What did I do wrong?

Was it not frozen long enough, or am I supposed to wait in between colors so that they dry up? Also, when you put it on do you smooth it over (like with a spatula) or just tap lighty? Thanks in advance, hopefully I'll have better luck next time.
Oh, and thank you for the tutorial, it was great!