We spent all day on Friday sanding with a Clark orbital sander. I finally quit around 11pm. We did it again on Saturday. We got the floor decently smooth. A belt sander would have gotten the floor perfectly smooth but there is a much higher risk of causing serious damage with one of those. We started vacuuming and dusting on Saturday night. I finished up on Sunday morning. We put the first coat of BonaSeal on around 11am and finished our second coat of Bona Naturale around 9pm. I have never used a waterborne floor finish before but I must say this stuff is awesome. After the first coat it looked great.