Shiny spots left before last coat of poly

Q: I am sanding a wood floor and I’m between coats. I’m before applying the third and last coat of oil based polyurethane. If there are a few spots that remain shiny even after using 320 grit sandpaper, is that okay?

A: No.  If there are shiny spots you haven’t rubbed those spots enough. You must de-gloss the finish.

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