As you may know, we live in a 110-year-old historic home in Detroit.

Hubby is refinishing the floors himself (we had a professional install new flooring in the kitchen), room-by-room.

After he sands and stains the floors, he applies two coats of polyurethane.

The last time he bought a gallon, a few months ago, the cost was $41.00.

Now the c…