My wife & I have bought a 30 yr old house with hardwood floors which have never seen the light of day. A tradesman friend of mine has sanded the floors & coated them with polyurethane. There are 4 or 5 places where there are gaps of up to 2mm (sorry - don't know inches) & my friend says these should not be filled with wood putty (it is winter here). I agree but my wife does not & she wants the gaps filled come what may.
If there is no resolution this will result in divorce -PLEASE HELP ASAP.