Yes, you want to fill cracks and sand again. As said, a semi-liquid
form mixed for the purpose. If you apply several coats of a good
quality polyurethane finish on top of that, you'll get a reasonably
crack free surface that can be cleaned with an iRobot unit. Don't
expect to use carnuba wax.
That makes me cringe. Here the boards come with T&G on all four edges and a
micro bevel on the long sides, no filler is ever used (except on knots) and
the best finish in my view is oil and wax. You can use polyurethane but the
result looks like plastic to me. Why buy expensive oak if you want it to
look like plastic?
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