Hey guys I need to seal some plywood I am useding for a top for my big tank. I don't know what kind of sealer to use. I was going to use marine paint but found that alot of the marine paints have copper in them and it might harm my fish. then I got to thinking that I would use a might basement sealer/paint. But I talked to the guys at lowes and they didn't know if that type of paint would hold onto wood b/c it's made for concrete. the guy at lowes thought a good coat of high glosss acrylic might seal it well enough but I don't know now i'm worried. And I need to have this thing made THIS weekend. I will have it made but I need to sealed also. So what Can I get from a hardware;/paint store to seal. Can I get a good acrylic and then maybe a topcoat sealer? What do I do. HELP