Rockwell used it
Norman Rockwell said (in a book of his that I was reading) that he often used shelac to cover, protect, and isolate his drawing before he began to paint. He said that way, if he got into real trouble, he could wipe off the paint and recover his original drawing. I've never tried it, but it sounds like it would work. I still have the book somewhere (I think) if you want the exact source.
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