Where to seal

Where should I put the stuff to seal my rack? on the top of every pice of plywood that acts like a (lid) or just seal the whole thing?

Anyone??

If you're talking about sealing the wood to stop moisture from warping it, at least do the undersides of all the shelves. Sealing the whole thing won't hurt anything either.

yea I just dont want mold or warping so. I dont really want to seal the whole thing I can just take more time..