when you use foam cores, do you cover them with plastic wrap or something else?

Is it o.k. to use 1/2" foam cores for all 6", 8", 10" and 12"cakes?
I think someone says 1/4" is enough to hold 6" or even 8" cakes but then
each tiers has different hight if I use different thickness of foam cores.
what would you do?

Thanks.

I too want to know. I actually remember there was an old thread about this, but I dont remember what was said I am going to be using foam core for a cake this wknd. I was planning on just covering it with wax paper...I hope this is the right way to do it. Hopefully, someone else will give us the correct answer

Cover it with plastic wrap or press and seal wrap. Waxed paper might not be too great because it's slippery and also it does strange things when it comes in contact with grease.

I use 1/4" foamcore for most things. It's strong enough for the tiers. For the bottom board I usually will glue 2 pieces of 1/4" together and then cover with fondant. The last cake that I made was pretty heavy (a 12" heart and the two halves of the sports ball pan)...the corset cake in my photos...and I did the whole thing on a single layer of foamcore, then after it was done picked it up and put it on the decorated board, and the foamcore didn't feel like it wanted to bend or buckle at all.

I have a box cutter. It's got a handle like a pocket knife, and it folds for storage. I've never tried cutting 1/2" foamcore with it, but I assume it would work for that too. It came from Home Depot (and it's purple which is how I ended up with it, long before I needed to cut foam boards for anything)

Some people use a hot knife, which you can buy at the craft store, but for accident-prone people like myself, the box cutter seemed like a better bet.