how do I not get air bubbles in my buttercream on the top layer with the upside down method?  after I chill it and sides are perfectly straight, I go to peal away the wax paper on the top and there are little placers where air bubbles were.........  how do I prevent this?  tia

I read somewhere a while ago to rub trex on the wax paper before spreading the butter cream on it and that is suppose to stop the air bubbles. I tried it the last time I did the upside down method and don't recall getting any bubbles hth.

whats trex?

I could be wrong, but I'm pretty sure it's the equivalent to Crisco. They just have a different name brand overseas. :)

Sorry Snazzycakes1 I'm in uk,  trex is the same as crisco as far as I am aware.