I've been lucky so far that Jag has never peed on his shelf. I still would like to water proof it because the spraying and higher humidity isn't good for the plywood, even the better quality one.
Polyurethan is often used but you have to let it air out for a long time to make it safe. The smell is potent!
I've come across this on my research. Very safe and non toxic and one good layer should do it. It's expensive though and not easy to work with...esp. using a brush. But I will give it a go. Need to figure out whether to go with clear or black, but I'm leaning towards clear.
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