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They all vary from companies to companies and hardwood to hardwood.
Generally speaking, if a hardwood has 10 years warranty:
it means it has 3-4 coats of a finish. If the hardwood has 15 years of warranty,
it means it has 4-6 coats of a finish. If the hardwood has 20 – 25 years warranty,
it means it has 6-8 coats of a finish. One thing I want to mention
about the finish of a present pre-finished hardwood floor is
that they have come a long way from couple of years ago.
These days pre-finish hardwood has an aluminum oxide in the finish
which makes the finish very durable and it lasts much longer.
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