Refinishing hardwood floors with polyurethane can produce a fresh, new loo, but also give off a foul and sour odor that can often take your breath away. The odor can be so strong, that it can cause a person to gag and cough and it is not always easy to get rid of this smell. However, it is also not impossible. To get rid of a polyurethane smell, the easiest thing you can do is open the windows and air out the room. You can try and camouflage the smell with candles or other room deodorants, but sometimes the odor is so overbearing nothing will camouflage it.