M — you might try the refinishing question in the bowmaking forum, as there are some very experienced folks there. I’ve not personally refinished any glass-backed bows, but probably the same finishes as used on new bows would work fine, the most accessible and cheap being a good spar-urethane like Minwax spray. The important thing is to keep moisture from reaching raw wood, and any old sealer will work for that including super glue, if you’re not worried about appearance. Cool old bow you got there. ttf