Linseed oil dougfir floor. Help
Check out the National Wood Flooring Association Website for expert advice.
As far as putting Urethane over it I would say NO WAY If it doesn't work out get the sander back out and start over.
I feel the same way about waxes. In this day and age there are some pretty tough finishes out there. The Pro-Finisher at Home Depot is actually a pretty good finish. It has a high solid content and is fairly inexpensive. Don't let the low price tag fool you into thinking it is a poor finish.
I generally tell people that if they don't have anything better to do with their time than oil, wax and buff their wood floors then they need a hobby.