I think you should lay the pipe down and get a few hours of sleep and then a few cups of coffee and come back and try again. We now after 3 seperate post know that you need sealant for a plywood tank. What we do not know is if you are trying to seal plywood to plywood in a corner, etc or if you are trying to seal plywood to the front glass. And if you are still having trouble putting it into words take pictures and post them up with your questions.
ok sory the tank is built what i trying to do is protect the wood like you would with a plywood fish tank what sealent would you use .i'm attaching the glass to the tank with a hing its gonna be a door its http://www.youtube.com/watch?v=uzAQQ0iBRCE