Once in a while, you have to shake your head. This office is the business place of one of our residential customers. The guy who 'maintains' their floors apparently thinks that waxing over dirt will make it shiny. It took four of us twelve hours, working through the night. Gang, you should have seen the elves scraping and working the unbelievable caked, nasty crud. They were on their hands and knees almost all night. I was finally able to put down several coats with only 1/2 hour to spare before the owner arrived. Could not even burnish it. But perhaps the next time. The pictures barely do it justice.