I have acquired some time ago, an old Harmony exactly like this one.
https://www.brokenstringguitars.com/...ic-guitar-300/
The back of the neck had chips, gouges and scratches that I had no choice but to sand out to make it smooth again. It's not a good sounding guitar but may as well make playable.
What would be the best procedure to refinish the back of the neck with stains or paint, varnish etc. that you can get from local hardware stores? I'm not real fussy about it.