Sunlight soap will fix a small leak in any metal tank, just rub the soap over the crack and it will block up a leaker. We used this on fuel tankers for years as a way to stop leaks in an emergency.
As aside - welding tanks can be lethal to the novice. The only safe way to degas a tank/drum is to wash it out with hot soapy water then apply steam for about 30 minutes. Every few months I hear of someone either cutting or welding drums that have not contained flammable liquids getting blown up as the residues exceed their flashpoint. Aluminium tanks are worse as the aluminium seems to absorb petroleum products and will "sweat" vapour when heated.
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