Filling gaps and last sanding round
If you want to fill the gaps in your wood floor mix the collected sand dust from the second sanding round with the special wood-filler. Don’t make too much at once, it dries rather quickly. Fill the larger gaps with a scraper as best as possible, don’t worry about excess filler on the wood blocks, the third sanding round will remove it. If you want you can also ‘plaster’ the whole floor with a thin layer of filler, using a flat trowel, to fill almost every tiny gap.
After you’re satisfied you’ve filled all gaps you wanted to fill leave the applied filler to dry out sufficiently, 30 to 60 minutes depending on how deep the gaps were.
Then use sanding paper 120 for the third sanding round, this will remove the excess wood filler and give your wood floor the smoothest surface, ready to have a new finish applied to it.
Once again, vacuum-clean the whole floor.
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