I pulled the fuel tank from my Hunter 33 and found the sludge wasn't too bad. Spray washing and quick swish of muriatic acid got it pretty clean. Great! Oh? Whats this? Hmmm ... a leak from the corner... I used this stuff http://aluminumrepair.com/land/index.asp?src=msn and the repair looks pretty good. Anyone else used this or have any experience with it? Now that I have the tank out I'd rather put in a new one now if I'm going to end up there shortly anyway.