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How to stain floors
Repair obvious defects such as nail holes, cracks or gouges in the floor using a wood putty or filler.
Sand floor in direction of grain of the wood.
Use a floor sanding machine and edge sander or sand by hand.
If sanding by hand, use 3 different grits of sandpaper , 30 , 60 and 80. Vacuum floor between each sanding and when finished.