So I am wanting to build a cage for thee rats that I will be getting eventually. So the problem I am running into is, how to make the shelves at least semi water proof so they are easier to clean. Also is plywood safe to use or would people recommend something like pine? I will only be doing sides, shelves and a bottom storage area, as the back in going to be hardware mesh to have more ventilation. Any input is helpful, I've heard Minwax is pet safe but not sure also I live in Ontario so it has to be something I can get access to.