Need best product to seal/finish sanded hardwood floor.

Dei26227695
by Dei26227695
I just sanded dark stain off a hardwood floor. As I sanded, I saw why it had been stained so dark - the floor was covered with these little circles scratched into the surface! I sanded even deeper to get the marks out.

It is beautiful bare wood now. I want a good sealer and a very strong finish for it. I put a lot of work into it and want it protected from scratching and pet accidents.
This shows the color the floor had been stained and the sanded hardwood. I was going to keep both but decided to sand the whole floor.
This was the surprise as I sanded the stain off - little circular scratches all over the floor. Now I know why that was the only floor stained so dark.
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