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Brazing requires some careful procedures to avoid making the tank into a bomb. Soft solder works fine for plugging leaks, but as Danno said, it's not very strong if you're going to rely on it to support a fairing.
There are different things that are called "silver solder". The type that is a brazing alloy has a high melting point and requires a torch and brazing flux. The torch probably needs to be something more substantial than a hardware store propane torch, although they can work in applications where the heat doesn't flow away too quickly.
There are some soft solder alloys called "silver solder" that are marginally better than tin-lead solder. If you were able to melt it at all with a soldering gun, it was the soft solder type.
When I've used soft solder to repair a pinhole type leak in a tank, I've used an iron like the upper one, or one like the lower one with a torch to heat it.
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