We had them sanded and varnished 20 years ago. Don't want to have them sanded again as I worry they will be too thin. I have revarnished over the years but they get a lot of use and scuff really easily, some of the bits now without varnish look a bit grubby despite occasional washing. We have a big family and lots of animals so decent replacements would also get scuffed.
Is there anything I can put over the top of make them look better, cover up the unvarnished bits etc?