Hey guys. This might get moved, but I wasn't sure where to put it. My little brother found this old tank-like thing I used for a project in third grade, and now he wants to make it into an aquarium for his room. The background paper is still on it. It has a wooden base with plexiglass sides. It's not watertight right now, as the water soaks through the wood. Is there a wood sealant that we can use, to make it hold water? I'm just not sure how to make it watertight for him. Thanks.