Shellac can be repaired by going over the damaged area with denatured alcohol. Depending how bad it is.
Shellac is a resin secreted by a beetle. I think the female lac beetle. Pounded into flakes and dissolved in denatured alcohol.
This can be reactivated with denatured alcohol and "redistributed" on the surface repair scratches.
French polishing is a technique I have not developed.
Edit
Just looked at the picture. That is deep. May be beyond total repair. But if you can find someone that does French polishing you may be able to minimize it.
Bummer
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2007 Indiana Scout
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Plus a few lower end I have had for years
Last edited by rstaight; 02-10-2019 at 07:05 AM.
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