replying to Jeff, Oliver wrote: Untimely for one project though may be good for reference to others: I installed prefinished 3/4 oak wood floor in kitchen. The cabinet install required cutting baseboard heating line on the cabinets. When I saw such a small amount of water (about a full drinking glass) starting to cup the boards I had just installed, I was convinced to do something. I chose a paint roller, tray, and oil-based polyurethane. Three coats was what it took so that all tiny seems accepted and were filled to keep water from running through like a sieve and it was layed tight. The sacrifice is the clear as glass beautiful factory finish. The floor could begin to look comparatively plasticized. Also, pressure gouges will emphasize that there is too much polyurethane leaving snail trails. However, I still reason living on a prefinished kitchen wood floor with accidents could lead to unevenness and dirt not allowing the return to normal by allowing it to dry, and that is just with water. Soda, coffee, syrups, could all be horrible attractants for dirt and insects as well. If your wood floor is installed over an actual vapor barrier and not just rosin paper, the spilled liquid may run under the boards much further than the spill area with and against both grain and pitch if your floors are flat though uneven. I do not recommend purposely spilling water to check it out, it could add a couple weeks to get best dried results (and it win?t Be perfect). Paste wax, danish oil or linseed won?t do it and neither will other fillers. Test behind the refrigerator. My instance was for an apartment. Again, the floors could further be skillfully sanded in the future and the floor will be in great shape.