Spar varnish. Two or 3 coats
Varnish has a yellow cast to it and will yellow over time. Three coats of a water based polyurethane. Does not yellow.
Here is the great video for this purpose. It will help you. https://www.youtube.com/watch?v=Hl0tjSnT8ss
Good luck! Bushra- https://bushraslifestyle.com/
Water-based polyurethane, with several coats will be easily wipe-able and durable.
Yes, subtle sheen is definitely the way to go with vintage.