I have some plywood that came from a large crate that I disassembled. I was thinking about cutting multiple sizes and shapes of cake boards out of this wood. I am concerned however about it being food safe. I would of course cover these in foil but still have some concern about it. Is there any way that you know of that I can disinfect these and/or seal these with a food safe product? Any advise would be greatly appreciated.
Lots of ppl use ply wood cake bases. I know some people who buy it from home depot and cover it with contact paper. Maybe use a cardboard cake board and cover the ply wood in foil (as you mentioned), or contact paper.
plywood is so heavy -- count that in to whatever you decide to do -- you can probably polyurethane it -- and keep the cake on it's own cardboard circle -- not right on the wood --
Yes, as the others have said, it is usable IF it is coated in polyurethane then covered in foil or contact papers (shelf liner). As K8 said, always have the cake on a cardboard cake circle even with having covered the plywood as described above. Use double-faced tape to adhere the cakeboard to the base board. Sometimes I just used a good dollop of b'cream.
I make my own cake boards from left over plywood and particle board all the time. I cover them with a double thickness of foil to seal them, then some decorative finish - fondant or pretty paper. My cakes are always on their own cake board and do not come in contact with the base at any time.
If I make a lot of cakes, I would use foam core boards, too. Since it is just a hobby, I try to keep the costs down as much as possible and since we are always doing some construction project, we always have left over plywood.
yeah i mean the one way i learned about the prohibitive weight of plywood was i had some bottom boards out of plywood 
but i did more cakes from home over the years for family and friends so i ditched that idea real fast -- plus the hassle of getting them returned -- no es bueno for k8t -- there's no wrong way -- and recycle is a great way to go -- in my early years i would harvest cardboard and cut and cover it with florist foil --
until i learned florist foil is not approved for food and when i thought through the ickyness of slightly used cardboard hahahahaha -- whoops but don't beat me up this is like 40 years ago -- i KNOW better now 
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