Ok everybody lets all get on the same page. You can infact apply poly over 'some' penetrating finishes. To know for sure you would need to test it out. 3500 sq is too much of a gamble. What I would recommend is Rubio monocoat Universal Maintenence Oil. It will add shine to. It's formulated to go over competitors oil finishes and I've done this several times. If you want specific info on this feel free to call me directly 7807077542.
Q
Better
Q