This is called cupping heavy sanding with a drum or orbital sander can actually take down some minor high areas.
Wet sand hardwood floors.
Flooring experts estimate that hardwood floors can be sanded for refinishing up to 10 times depending on the thoroughness of the sanding and the level of wear and tear on the floor.
Cupboards doorways closets and any other areas or items where you are working should be protected from dust with plastic.
Store and dispose of oil soaked rags properly.
A step by step video for a home owner on how to use various wood floor sanders and how to apply the finish.
Hardwood floor sanding diy instructions.
To sand hardwood floors start by renting a drum sander and installing a coarse grit sandpaper onto the sander which will remove any noticeable damage or old finish from your floors.
With that said i have now spoken to way too many people that will be sanding their floors by hand no matter what.
As i have said many times before sanding hardwood floors by hand can be a lot of hard work.
After drying a wood floor you may have some concave or convex floorboards.
However heavily cupped wood cannot be sanded down flat.
Hard work that can be alleviated with the use of a floor sander.
Situations differ but you may not be able to refinish your hardwood floor more than 10 times.
Solid hardwood engineered and laminate flooring wet sanding hardwood floors want to remove carpet installed over circa 1957 oak flooring and get back to orig.
Then sand the entire area at the same angle moving constantly as you work.
Have dry sanded badly varnished stain.