Identifying the type of wood finish is crucial for touch-up repairs, and it can be done through a sequence of tests starting with oil, shellac, and lacquer.
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Wood Finish Identification & Finish Repair (oil, shellac, lacquer, and poly/ varnish)
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Wood Finish Identification & Finish Repair (oil, shellac, lacquer, and poly/ varnish)
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Repair damage to lacquer finish?