How to Stain and Seal Hardwood Floors
Use a rag or paint roller to apply a penetrating stain.
Follow the grain of the wood. Try to apply as even a coating as possible. Select a stain that won't raise the grain of the wood or you'll have to sand the floor after applying the finish. Allow to dry for one hour.
Floor finishes can emit harmful vapors, so be sure the area is well ventilated as you work.