- 1). Sand the stained area down to remove the floor’s finish, using 150-grit sandpaper attached to a sanding block. The sanding block will ensure that you do not inadvertently sand a divot into the floor.
- 2). Mix oxalic acid crystals with water in a disposable cup. Oxalic acid crystals are readily available at home centers and paint stores. Follow the crystal manufacturer’s directions closely to mix the crystals and water in the correct proportion.
- 3). Put on rubber gloves. Pour a small amount of the acid solution directly on the nail marks. Allow the solution to work into the wood for one hour.
- 4). Apply the acid solution a second time if the marks are still visible.
- 5). Wipe the repair area down with white vinegar to neutralize the acid.
- 6). Wipe the repair area down with clean water. Allow the floor to dry.
- 7). Put on rubber gloves. Rub floor restoration paste into the repair area until the finish matches the surrounding boards. Note that you will most likely have to apply several coats of the paste if the wood is dark.
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