Whenever i do a flooded piece with royal icing, the baking paper that i use goes a bit wavy after a little while and my pieces don't end up drying completely flat, does this always happen for everyone else and if so what do you do to stop it?

I tape down my paper around the outside but that doesn't stop it. Does it have something to do with what i am piping it on?

what is best?... baking paper (parchment paper) or waxed paper?

I use Waxed paper. I haven't had a problem with it if I buy a good heavy brand , but one time I bought a cheap generic kind and it did the wavy thing.

so does wax paper repel the wetness of the RI better?

I like acetate.

Yes the wax on the waxed paper repells the water better..

But like PinkZiab said acetate would work great! I think I will use that next time since it is clear and won't wrinkle.. Great tip Pink... Thanks!

awesome, thanks for the help everyone!