Hum..... err.... after polishing it 3 days ago, and not touching it any further, I just noticed these areas today.
It's hard to photograph, the guitar is glossy, but there are matte spots "underneath"? I don't know how to describe it best.

They weren't there when polishing it, but as the gloss is not broken, I don't think these are spots where I polished through? Or are they?

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Alas, as I wasn't happy with the finish anyway, I think it's best to go back adding a few hundred coats of poly

Not very motivated...