This would be my guess. I never apply tape to any finish that hasn't at least gassed off to the point that it would be ready for final wet sand an polish....or maybe too early applying and covering with tape when the poly has not finished venting the solvents....
I presently have a maple neck/fretboard that has undergone a re-radius and awaiting a re-fret. It will be getting a spray with satin poly after I have installed the frets. I won't do a level & crown for at least 2 weeks after the poly goes on.
However I will do the fret ends before spaying the poly, but I can safely do that without masking by using a proper fret end file.
Never had any issues with masking poly doing it this way.
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