I've done that many times before, but it all depends on how much weight you're going to put on it. Are you doing a tiered cake?
If the layers are each 2", then you'd need some good support for the bottom... If you glue about 3 or 4 boards together and cover them, you should be fine... the main thing is to make sure the boards wouldn't bend with the weight of the cake on them.
It probably would do ... I'd kinda push on it a bit just to see if it would take the weight ok
I've used doubled up cake circles before. I was nervous about the strength of the boards, so I was very careful to sit the cake on a smaller, inverted cake pan, so I didn't have to pick the cake up from the edges and cause the circles to bend. I'm thinking of investing in masonite boards.
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