Niekie,
We were able to save it.
We Started by heating little spots, as small as the flame fom a rosebud would allow(2" spots). starting at the perimeter of the boil.
We heated about 8-10 spots around the outside of the oilcanned area and let it cool, then we started working closer to the center, but always staying just at the edge of the oilcanned area. .
always only heating 6-10 spots at a time with those 2" spots and letting them cool.
It took a little time but we were able to get it looking like it never happened.
I forgot about this post or I would have followed up.
Regards,
Carl