Do you use waxed cake circles or just plain cardboard? Does it matter?

I cover plain cardboard with freezer wrap. Some people use plastic wrap to cover the cardboard.

Use whatever you want...as long as it's food safe. I have been stuck in the middle of the nite and cut from a box then covered in clear wrap and freezer paper. Not my fave but I was sure nobody would get sick. mimi

I personally use waxed cake circles.

No cardboard in my cakes... I use masonite under every tier.

WHAT ABOUT FOAM CORE? MY MICHAELS INSTRUCTOR RECOMMENDED IT...

cake circles, no covering

YES BETWEEN THE LAYERS OR AS A BOTTOM BOARD. I'VE USED THEM IF I HAVE DONE A CHARACTER CAKE AS WELL BECAUSE YOU CAN CUT THEM TO SIZE.
SHE DIDN'T SAY WHETHER TO COVER OR NOT BUT I WILL COVER WITH TINFOIL FOR A BOTTOM LAYER TO RESEMBLE A CAKE BOARD.