I took a look at the MSDS for the product. Looks like the primary solvents are keytone and xylene. Those two will dissolve just about anything ever used for wood finishing. Add to it some polyurethane, mineral spirits for the carrier, maybe a bit of tung oil, and voila'. Deardorff used lacquer for their finish which was a good overall choice, best overall in the era they started in.
My 'Dorf is a user too. One of these days, if there's ever a convenient opportunity, I will take it down and refinish it with the same stuff I used on custom rifle stocks. Of course, I'm not sure when that convenient opportunity will come. Maybe we will have a record blizzard this winter.