Filling wide gaps with pine slivers is an effective and durable method. To do this:
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Apply wood glue to both sides of the sliver.
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Tap it firmly into the gap using a hammer or mallet.
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Once the glue has dried and the sliver is secure, cut off any excess wood protruding above the surface.
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Finally, sand the entire floor to blend the repair seamlessly with the surrounding boards.
This method provides a solid and natural-looking repair, especially suitable for pine floors.