my daughter got a rabbit and is slowly working on a large enclosure for him. she has ramps and levels made of wood and I would like to make the wood at least slightly water resistant so the bunny pee ( until she gets it litter box trained which she is working on) doesn't completely soak into the wood. are there any shellacs or something of the sort that are safe in case the bunny decides to nibble on the wood? any advice would be greatly appreciated