Poor technique is often the cause of swirl marks.
Fix swirl marks in finished floor.
The important part is to never skip a grit or a section of the floor during finish sanding.
Most people sand too fast.
That is they move the sander too fast back and forth over the board causing the swirls to stretch out and look.
Finishing hardwood floors is one of the more tricky aspects to installing floors.
1 sweep or vacuum the floor to remove dirt and debris.
They are scratches that appear in a circular pattern in the wood or finish.
Ro sanders leave swirl marks they are designed to do that.
One area in my floors when the sun hits this spot i can see swirl marks.
The key is to keep those swirls dense so that the eye can t perceive the individual marks.
Sometimes they are only visible with intense light such as under can sometimes called high hat lights or in front of patio doors.
Perfectly finishing a hardwood floor without any swirl marks is a challenge.
Sanding the floor to remove the surface layer is often enough to remove swirl marks and you can have that perfect finish you desire.
I just had my floors refinished due to a water damage.
Unfortunately swirl marks tend not to show up until finish or stain is applied.
The dreaded swirl marks happen when we are buffing.
After removing the swirl marks and imperfections sand the entire floor again with 60 80 grit followed by 80 100 120 grit.
Rubio monocoat recommends finishing the hardwood with 120 grit so that is what i did.
Swirl marks on refinished hardwood floor.
If the sanding or screening process is done improperly swirl marks will appear on the floor.