I know for sure there is at least one guy here who does it. I don't get to play with burl much. I have cut some thin slices off a burl (gonna make a couple clocks, the burl will be the face) I messed with it today just to see how it would take varnish, just as I expected. Burl is a total mess of endgrain and flat grain. The flatter grain took varnish well, the eyes which are endgrain just kept soaking it up. I know they make endgrain sealer blah,blah and a guy could really sand between coats too, which I didn't do I was just playing with a piece. Any tips?