How do I fix or finish a partially sanded wood floor
A &quot;wipe on&quot; polyurethane might get you most of the way there, depending upon how perfect you want to get it.   Lightly sand the damaged area to make sure there are no sharp edges or rough spots. Then with a lint free cloth, wipe on some (it'll take a few coats) and see if you like it.   If good enough, great, if not, and you really want it right, you'll have to sand the entire floor to bare wood and re-finish it all.