On Aug 3, 12:14*am, "
wrote:
Polyurethane glues such as PL400 that come in tubes (NOT Gorilla glue)
and are solvent based will penetrate the shellac if properly applied.

Robert

Yup. Although pretty drastic, that will work. PL 600 is a candidate
too. I was trying to be gentle, not knowing what was going on here.