Start at one end of the room and sand with the grain.
How to floor varnish.
Apply the stain with a foam applicator pad in the direction of the wood grain.
Use your brush to apply the new oil based varnish to the floor.
How to prepare varnished floors lightly sand your floor with 120 grit sandpaper.
Choose an interior wood stain based on the color you desire and the type of hardwood flooring you have.
Work one manageable area at a time such as four square feet.
If you want to change or improve the floor color apply a stain.
Pour a small amount of varnish onto the floor starting in the corner farthest from the door.
If your old varnish is flaking off use a floor sander to sand back to the bare wood.
Depending on the condition of the floor you may need to start sanding with a coarser sandpaper.
This will ensure that the varnish looks natural.
When making the strokes try to follow the wood grain.
Use less coarse sandpaper usually around a 120 to 150 grit abrasive to get a lovely smooth finish.
Apply in sections which are no larger than 4 to 5 square feet.
Use a long handled roller to spread the varnish first in the same direction as the grain then across.