I should have known I was in trouble when I saw the failed attempts from the previous owner. The bottom of the tank has two threaded holes. Into one screws the pump, into the other screws the drain petcock. They are both cracked. If I had to guess, somebody let it freeze with water in it. Well I got up under there and coated it with Plumber's Goop. (awesome stuff!) But it didn't work. So I had to actually cut the tank out of the cabinet with a saw. I unscrewed the pump and petcock, then screwed them back in with fresh plumbing tape, then slathered the whole mess with half a tube of Plumber's Goop. I checked it for leaks. Nothing. I put it back in and rebuilt the cabinet. Naturally, it still leaks. The problem, I believe, is this- The tank is made of a slippery petro-chemical plastic that nothing sticks to. The surface, even when clean and dry, always has an oily slippy feel to it. I am usually really good at fixing things like this and if Plumber's Goop wont do it I am at a complete loss as to what to do. Epoxy won't even stick to it, due to it's oily slippy nature. It's just two tiny cracks! How can I seal this bitch? Any thoughts? I guess I'll try looking for another tank, but I'm not holding my breath for one of those to pop up! .