How to Fix a Varnish or Shellac Oak Floor
- 1). Set up your floor buffer with its roughest screening disk. Run the buffer over the whole floor, with the direction of the floorboards, from one end of the room to the other, taking up the top coat of varnish or shellac. Vacuum the floor to remove the dust.
- 2). Repeat the screening process twice, with each successively finer level of screening disk. Vacuum the dust after each screening. The resulting floor surface should be dull and flat, free any shine, but still have the original wood stain in place.
- 3). Brush on the first coat of polyurethane with a wide paintbrush, starting at the corner of the room furthest from the doorway and working your way across. Apply the polyurethane in slow, careful strokes, with the direction of the floorboards. Look out for the formation of bubbles. Let it set for a day.
- 4). Sand the polyurethane by hand, lightly, with 300-grit sandpaper, using short, quick strokes. This should slightly dull the surface so the next coat of polyurethane will stick. Vacuum up the dust.
- 5). Apply two more coats of polyurethane in the same manner as the first, sanding between them. Let the final coat set for two days before using the floor.