A few years back I restored a nice French bass that had an epoxied-in breast patch. After planing out all the patch wood, I was left with a thick, uneven layer of epoxy. I tried every possible chemical I could get my hands on, and nothing worked. My solution was to run a convex scraper blade against a grinding wheel to create a vicious burr, then scrape until it went dull (5 minutes or so), then repeat over and over. It took a few days to get down to untouched wood, and some original material was lost. During the process I learned several new curse words and used them often.
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