This is what the floor in the office looked like before the Hoomans sanded it. I know it is hard to tell, but the stain wasn't even and the sealer was poured on without being spread well. So you could see globs of it. My Hooman rented a big belt sander and set off to tackle the floor.
This is what the floor looked like after it was sanded. It was sanded with 25 grit, all the way up to 80 grit. A new level of grit was used each time the room was complete. You can see it's not perfect, but these are the original 1940's oak floors, so my Hooman wants to save them if possible. I watched the Hoomans work. It's definitely not easy.
