3 wipe the area with mineral spirits for an oil based stain and water for a latex stain.
Floor stain damaged.
I speculate that this is a water damaged rotted floor that was sanded and re finished without pulling up damaged flooring and without cleaning the area below.
One stain or water ring can ruin the look of the whole floor.
If you are concerned about mold contaminated flooring.
Pet stains on wood floors.
Pet urine stains on wood floors pet stains can ruin wood flooring.
Stains are deep enough into the wood that almost no amount of sanding will remove them.
If you have small areas of damage in your hardwood floors you might not have to refinish the entire floor.
If your wood has only small defects and the remainder of the wood is fine you can spot sand and stain.
Mix up your bondo apply to the uneven damaged section then sand smooth.
4 for a dark stain apply bleach or oxalic acid according to label directions to lighten the stain and then lightly sand in line with wood grain using 150 grit sandpaper.
Stains are the toughest fix when it comes to hardwood floors.
Fold a piece of 100 grit sandpaper into a small strip and then use one.
2 vacuum the area with a shop vacuum.
Here we add another flooring damage example provided by a reader.
You may be able to repair stains nicks and scratches.
5 mix up a stain to match the existing floor color.
We think the floor shown in the photos here was damaged by a solvent spill that was left unattended.
Repair major damage if you have a charming wood piece but a major eyesore is detracting from its overall look it s time to break out the bondo all purpose filler.