I've painted all the timber work of a property in water based satin and wondering whether varnishing (water based) over the banister makes sense to add protection. Does anyone recommend this?
It will go grubby over time. The varnish may help prolong the grime, but you'll still get a build up of scum unless you wipe it down occasionally.
I have the same problem in rental properties. I'd gloss the hand rail personally...in fact it's generally better to gloss woodwork in house shares as it soon gets grubby.