Bought this to use on hardwood floors already protected with Bona Mega wood floor finish. I’m not too sure why there are so many negative reviews. I vacuumed my floors, cleaned them with floor cleaner and then used both the Bona applicator and finish. Results were great..pretty simple. I have two labs so not every scratch was filled in, then again I didn’t expect it too. I think Bona is the leader in floor care and for people to post negative reviews either they aren’t following directions or the floor surface isn’t prepped correctly.