I also use oil for my beach and oak worktops this I bought in France as âHuile pour plan de travailâ in one of the Bricosheds, they also sell âVitrificateurâ to seal wood floors but I have no personal knowlege of that.
I agree with Roger, you should oil your frames and not paint them, Linseed or Tung oil will be best. You can get them at Oleobois online
I would avoid varnish - itâs really easy to apply a quick coat of oil when required, very little preparation required and much healthier for the environment. I donât know much about floor sealing but if you join the renovation group someone there might be able to help you with that.
Cant help with the sander but as far as treating the wood I now tend to use Wood oil (Rustins danish oil in the U.K) rather than varnish on frames, It doesnt peel off like varnish and if you treat it when it looks tired its a 10minute jobâŠno stripping!! Might suit the floors also.
Me old mum used to treat her floors with solid bees wax disolved in lighter fluid, much like O Cedar? but thicker.