This is how your tank might look now. Dents and creases all over.

The other side is just as bad, if not worse.

The first thing to do is take the bottom out completely by grinding away the factory welding.

All of the dents can then be beaten out from the inside and the tank returned to its original shape.

The bottom is welded back in and the tank tested for leaks.

With paint and decals the tank is as good as new.