Although we have tried to do most of the work on Christian's farmhouse ourselves, sanding the old pine floors and sealing them is being done by Duvan's Hardwood Flooring. They are a family business which specializes in restoring and refinishing floors, with much experience and willingness to please. Here are some rooms after one day of sanding.
I have 10 gallons of Bona Woodline Semi Gloss Polyurethane which has an amber tint and is highly endorsed, to seal the floor boards. It's a Swedish product I ordered through Amazon.
We feel lucky that all of the water stains are removed and many interesting large knots and boards
are obvious now.
Christian and Leif worked hard this weekend finishing the floor preparations.