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When will this floor need resealing?
There is no universal interval, whatever you have read. It depends on what is actually on the floor, where it is and how hard it gets used.
The floor tells you before a calendar does
Two signs matter more than any number on this page: water soaking in instead of beading, and walking lanes going dull while the edges stay bright. Either one means the sealer is near the end of its life, whatever the interval said.