We have a 30 year old home and the baseboards and door jams are stained a dark brown. We are replacing the floor and will replace the old baseboards, but I was wondering what we could do to use the old door jams. The varnish is very thin and worn away in some places. Can we sand off the varnish, prime and paint over it? If so, how far down do we sand? I know it will be a lot of work, but I think it will be less expensive. What do you think? HELP!