I finished constructing my aquarium hood. How can I seal it to protect it from water and mold? Any suggestions. Dan I take it your hood is made of wood? If so, get some polyurethane. Minwax and Deft are two brands I have used with success. If you want to make it look nice, give it several coats, sanding with a very fine grit sandpaper in between each coat. -Dave Gauthier