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Just go slowly & don't tap anything hard. You can reinforce the inside of scales with a layer of fibreglass or glue to thin brass.

I agree with above posts .
Altho the edge is cleaner now, take it to the hone & see what happens. It may be just fine when you hone past the original edge. No crystal balls here to say it's all...

I come from an automotive background too but I can tell you with body panels you have a whole lot more steel to work with. :p
What may appear as surface rust can become a chip in the edge when...