I have 2000 square feet of hardwood floors, and in some areas the poly looks like it is peeling off. So far I have made one huge mistake: I cleaned all the floors with ammonia, and that took the water, dirt, and wax off of them. Then I used an oil based product called Dura Seal on two rooms. It made a huge difference. I then added a water based poly to one room and it dried great, but you could scratch off the poly. I do not know what to do about that. I do not want to sand my entire house. Can you put a stain over old oil based polyurethane and then use an oil based poly? Any suggestions?