Re: removing latex from chair
Paint thinner should be able to soften and remove the latex paint without harm to the shellac finish. Do a test on the underside of the chair first to make certain that there will be no harm, then proceed with the paint removal.
FWIW, paint thinner will remove most paint build up in paint brushes, so soaking a paint saturated brush in thinner will soften it enough to be combed out with a wire brush, then wash with hot soapy water. Oil based paints can be removed with lacquer thinner.
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