On most floors stains gaps buckling warping and mold are water related or moisture related problems in flooring systems.
Floor stain damaged.
If you are concerned about mold contaminated flooring.
Pet stains on wood floors.
Stains are the toughest fix when it comes to hardwood floors.
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.
Here we add another flooring damage example provided by a reader.
One stain or water ring can ruin the look of the whole floor.
Fold a piece of 100 grit sandpaper into a small strip and then use one.
2 vacuum the area with a shop vacuum.
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.
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.
3 wipe the area with mineral spirits for an oil based stain and water for a latex stain.
Bondo is an alternative to normal wood fillers preferred by many furniture restorers on hometalk.
You may be able to repair stains nicks and scratches.
Mix up your bondo apply to the uneven damaged section then sand smooth.
This process usually requires testing.
Pet urine stains on wood floors pet stains can ruin wood flooring.
If your wood has only small defects and the remainder of the wood is fine you can spot sand and stain.
5 mix up a stain to match the existing floor color.