What a bummer, I had one recently. Note the past tense. Fortunately I could get to one side of the stainless steel tank that had two small leaks. Since it is a ss tank they were in the weld. The other was a whole different scene as it was against a bulkhead on the far side of the tank. Moving the tank would be a big problem even the few inches required. The tank is 26" frt to back 29" high and 48 inches long with an inspection hatch midway on the long side it is 7" in diameter. After much thought measuring and commiserating with friends the consensus was that I use a prodect called SPLASH ZONE by Devoe Co. It is an epoxy resin, 2 part. I have used it often in the past and had some on hand . It's shelf life seems interminable as my cans of it are over 6 yrs old! Any way it is the consistency of stiff putty, one black and the other white. These are mixed equally in your hand. It is applied with your fingers as this gives excellent control or with a putty knife this project req finger work! I rubbed it onto the seams of the tank all around I mean really put it on there as there was no need for pretty work here just cover every bit as I could not see where the leak was on one part of the tank. Note that this stuff hardens like steel and is then treated as such. It can be ground ,drilled filed and painted if need be. It adheres to almost any surface glass, steel , ss , alum. fiberglass and the like. Given the demensions of the tank I was able to reach all seems except the top far corners , so I just applied it to the OUTSIDE of the tank. With its adearing properties this was no problem. END OF LEAKS A friend of mine had a commercial wood fishing boat that developed a leak under water, a diver went dwn and applied it UNDER WATER it held for years. CCRIDER , my trawler ,sustained a deck leak , a hole 15 inches long and 5 inches wide during Hurricane Andrew . While it was still pouring rain I applied SPLASH ZONE and it held until I could get the boat to a ship yd monthes later. This is one of its greatest attributes , that it can be applied to a wet surface. There are similar products on the mkt such as JB WELD that comes in very small tubes. S. Z. is packsged in 1 gal cans and I think 1 qt cans , Of course you need one of each. A qt goes a long way as I probably used about 1 pint or so on this 130 gal tank. I have kept it on hand for my various boats for over 20 yrs. There was a fitting on top of one of my diesel tanks that was impossible to get to and it would drip a small amt of fuel when the tank was completely full so I puttied around it with S.Z. and end of leak. That was 12 yrs ago. As to the handling of the product I usually wear surgical gloves but it is not really necessary just makes cleanup faster. By the way clean up is with water just wash your hands! If you let it dry on your skin you must rub harder. Keep your hands wet while working the product and it will not stick to your hands Just like using silicon sealant. This is grt stuff and I highly recommend it. I am not a dealer , or any thing else! If you desire more info email me off list. Chas Culotta Patterson,La.