Antique door refinishing

Recently purchased an antique set of French doors for a new construction office entry. There are a few patches where someone replaced strips of wood and put what looks like white bondo over the patches. I’ve already sanded with 120 grit and feathered the edges of the bondo. My plan is to put Osmo raw 3051 on it to keep the natural look but add some protection for longevity. Has anyone refinished a door with this bondo stuff on it? Any advice on the Osmo coating?