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Looking for a non-toxic, water-repellant sealant for wooden shelves in a gerbil cage

Sophie asked 4 years ago
I'm building a wooden "topper", or cage, to go on top of my gerbil tank. It will contain some wooden shelves, and gerbils like to pee on raised areas, so the shelves need to be sealed. Gerbils also tend to chew wood, so whatever I use needs to be non-toxic. Do you have any suggestions for a non-toxic, water-repellant sealant I could use? I'm in the UK.
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